Just thinking of some random games that were either under rated, or a bit obscure, or whatever.
Alex Kidd In Miracle World.
Not many better 8bit platformers. And none that don't have a plumber with a red hat on in them. Great game.
Eternal Darkness: Sanities Requiem.
Sorta Resident Evil but different. Much fun playing this. And speaking of Resident Evil...
Resident Evil!
Is this series under rated? Remember the first time the dogs jumped through the window on the PS version? And right up to Resident Evil 4 which is brilliant. And 5 looks great too. How many other series of games have been that good for that long?
I'll add more as they come to me.
Add your own random, good-but-nobody-has-played-them, or long forgotten classics.