I'm service oriented.
For me, pinballs aren't much fun if they aren't working.
Gottlieb had a reputation for being harder to fix than Williams/Bally.
Two or three years ago I was thinking "Now that Williams/Bally System 11 games are getting towards 30-40 years old, and I'm starting to see many rare issues become common, I need to reconsider whether Gottlieb is NOW about as reliable and easy to service as the Williams/Bally games."
Then I worked on half a dozen Gottlieb System 3 games.
No question.
You want a working machine? Gottlieb is harder to fix.
It's not their engineering. Some of the Gottlieb mechanisms are jaw dropping clever, and insanely reliable. But the overall quality of the machine is not to the standard of Williams/Bally system 11 games.
Gottliebs never made the money that Williams/Bally games made. If the gameplay was compelling, the quarters would have flowed. The quarters never flowed, so the verdict of history is that Gottliebs aren't the quality of FUN that can be had with System 11 games.
That having been said, I like playing Gottliebs occasionally. Their flipper system is always an interesting change of pace. I like the rules of some of their games, I like the toys of some of their games, and I like the shots.
But overall, you are better served with Williams/Bally System 11 games than Gottliebs.
Example:
RIGHT NOW, I'm coming off of a 30-hour Gottlieb repair. The customer brought a Super Mario Mushroom World (Redemption, small pinball, yellow sides) in very poor condition to me. They had multiple technicians attempt to repair this machine... it would get set out and break on location, they'd pick it up (echos of Black Hole...).
Some of the prior work was well done, some was not.
Mechanically, the flipper bats were shattered, the flipper mechanisms in poor quality. Yeah, it had been played. Rubber might have been original, it had been many years sitting in the back of this operators warehouse after every technician that had tried to get it working had given up. Plastics were ok, but the paint was worn down to the wood in several places, the inside of the cabinet sides were deeply scratched due to the hundreds of times the playfield had been lifted during various repairs. We touched up the paint, got flipper kits from Steve Young's Pinball Resource and replaced all the bulbs and rubber, deep cleaned the playfield.
Rebuilt the drop target assemblies with fresh grease, disassembled and repaired all the mechanics.
Coil sleeves were worn, we replaced them all.
Found three coil plunger springs that were broken or had previously been replaced with the wrong springs. Got those things fixed.
Pretty standard stuff.
This is pretty easy work for us. Then we started to address this machine's problems.
Replacing the 500 ohm 1 watt pot used to adjust the +5vdc got the logic working. Battery dead, resoldered a new lithium coin cell onto the board because you have to do board modifications to put in NVRAM. Weird display of text writing over itself on the display was solved with a factory reset. That got the primary computer working.
Driver board was missing a few IRL530's (prior technicians had just pulled the transistors when they couldn't repair the coil and coil wiring problems) so we replaced those with IRL540's, and started dealing with the three coil issues. Two were melted coils, that's easy enough.
The other was the beacon light on top. Wiring here had rubbed it's insulation off and was shorting to metal. The beacon itself used at one time a rubber tire which had turned into goo. Pulled all that out, probably could have ordered correct stuff from Steve Young, but we just made the beacon not turn, the light would light up fine... except that the flashlamp socket was shorted, causing fuse blowing until we got that figured out. Also the motor that had previous turned the beacon was shorted. Have I mentioned that Gottlieb troubleshooting goes through a LOT of fuses? We disconnected the motor first, but the shorted lamp socket caught us by surprise.
Finally, beacon not blowing fuses, two coils not blowing fuses/driver transistors. Yay!
We lifted the playfield, and then the machine intermittently started blowing fuses. One of the lamps next to the drop targets had a diode leg that was shorting to the metal frame of the drop target assembly. I've had similar problems on System 11, System WPC, it can happen. Inappropriate touching. Sometimes it's easy to spot, sometimes it takes a while. This one took a while.
While troubleshooting this problem we found another spot where the wire had rubbed through it's insulation and was touching metal. Got that potential problem addressed.
Flashlamps on this game are activated through an auxillary driver board MA-1722. Previous technicians had repaired on this board on several occasions, but we are pretty good at board repair... (sad face) after several 'it works for a while' and 'but why isn't it working when we've replaced all the parts' we bought a replacement board.
Flashlamps have 'trickle power' through a .33 ohm 5watt resistor that was completely incinerated. Got that replaced.
We were feeling pretty good about this machine, then it started having switch matrix problems.
Which, because the Strobe lines for the switches (think about Columns on the Williams/Bally systems) are used for both the lamps and the switches, wasn't a switch problem, it was another intermittently shorted lamp socket. Surprising how much time it can take to fix intermittent problems.
Now, this machine was a 'tough dog'. Prior work for decades by technicians of various skill levels. It had sat for years in the back of the warehouse before it was brought to us.
I think about amusement auctions. Sometimes you'll see a game being sold at auction with some problems. Then you'll see that same game at the next auction being sold with problems, and the next, and the next. The same game. Each buyer had taken the machine in, and found out that 'nobody can fix it', and sold it back at the next auction. Usually we are the guys who fix the 'nobody can fix it' issues.
So, MANY issues here were just on the order of 'nobody can fix it'. Lots of prior work to clean up.
But SOME of these issues were Gottlieb specific (it's occasional to find shorted lamp sockets on Gottliebs, it's rare to find shorted lamp sockets on Williams/Bally), or complicated by the overall difficulty of bring Gottlieb machines up to fully repaired and good operation status.
Gottliebs are in general tougher to keep repaired. They don't stay working as long as Williams/Bally machines, and when they break, there is a statistically higher chance (in my experience) that the problems will be harder to find and fix.