There are a number of games out there that should be ranked higher than they are, but for one reason or another aren't... there are 4 that come to mind for me...
No Fear - great layout, lots of fun, can be set up to be punishingly difficult. Not sure why this one isn't ranked higher.
Maverick- great layout, tons of drop targets, challenging modes. Hampered by that stupid paddlewheel and some of the worst artwork to ever make it into a pin.
Comet - come on-- it's Comet fercrissakes! One of the absolute best of its era. My suspicion here is that most people have never played a quality example of the game. Most that I've seen are absolutely beaten to death with bare wood playfields, cracked ramps, etc. Find a good example of the game that's tuned right, and I think most people would change their minds about this one.
Cue Ball Wizard - this one is my outlier. It's a game that I have loved since I first played it when it was new. The callouts are awful-- you'll get no pushback from me on that. The art is pretty cheesy too. But it's a unique layout with interesting objectives and some very tough drop targets (especially the right bank). Cool wizard mode too.