I think the hate toward Ghostbusters may stem from a few things-
1. It is not an easy game to play. The right ramp and left orbit are pretty tight to hit. Some people complain about the flipper gap (doesn't bother me). 2.Hardware issues out of the box. The original Slimer mechs didn't register well. (Stern will send you a new style version if you have an old one) Some left scoops shot SDTM right out of the box. Playfield clearcoat issues plagued some games. Insert joke here about play field ghosting in a Ghostbusters machine.
3.This is a thread on Pinside
I think if you temper all of this with the initial hype and expectation of the game, there is your explanation. If you are getting a new one now, you probably won't have any of the aforementioned playfield issues.
While I haven't spent a ton of time on SW to fully weigh in on it, I think all three are good machines. As far as Pro vs Premium on these titles, I don't think any of them are worth the extra money(just my opinion, put down the rotten fruit). The Subway ramp on GB premium is neat and the right ramp is cool and maybe? easier to hit. Playability vs extra toys is a query in regards to some of the recent Stern titles as you compare the tiers. All this said, I have a GB pro and love it. Yes, I had to replace the Slimer mech and I have a couple of tiny slivers of insert ghosting. Mine is one of the early runs. AS looks and plays great, I don't really care for the band. I'm ok on SW but need to dig into it some more.

Side note- backhand the Scalari targets. They almost always will drop and it is a safer way to do it.