Quoted from pezpunk:

There seems to be four distinct categories of "underrated" going on here:
Pins That Play Well But Have An Embarrassing Theme / Terrible Art / Ridiculous Backglass:
- Hollywood Heat
- Genesis
- Rollergames
- Arena
- Raven
- Baywatch
- Heavy Metal Meltdown
- Future Spa
- Hardbody
Pins That Play Well But Are Themed After a Property Nobody Cares About:
- Johnny Mnemonic
- The Shadow (can this really still be considered underrated? c'mon)
- Congo
- Last Action Hero
- Lethal Weapon 3
- Maverick
- Big Hurt
- Demolition Man
Pins That Have Been Heavily Criticized On Pinside For Years, Perhaps Unfairly:
- Rolling Stones
- Avengers
- Tranformers
- Popeye
Good Pins That People Just Kinda Forget About:
- Mustang
- Roadshow
- NBA Fastbreak
- Black Hole
- WPT
- Sopranos
- Avatar