Using the Top 100 rankings as guide....
UNDERRATED (Not in the Top 100)
Baracorra
Catacomb
Alien Star
Embryon
Nine Ball
CRIMINALLY UNDERRATED (Not even in the Top 200)
Mata Hari
Devil's Dare
Road Kings
Superman
GTFOH! (Not even rated!)
Cosmic Gunfight
Beat the Cock
Punk!
I could go on. I won't even bother getting into the EM's. Different stokes for different folks. All pinball is good.