wow...best PC games ever? Tough choice there. So many to choose from, so many i like. Well if graphics mean alot to you, then that really cuts down the list. I'll just list a few awesome titles, even if they are old and the graphics suck compared to todays.
(in no particular order...just typin as they come to mind)
Halflife
Quake 1 & 2
Jedi Knight (the first one...havn't played the 2nd one yet. waiting for my new vid card)
Mechwarrior 2 Mercenaries (Mechwarrior2 and GBL also rocked)
FreeSpace 1 & 2
Loom
Thief (havn't played 2nd one either. but i have it
)
Alice
Dark Forces
sIn
Decent (all of them!)
Star Craft (and the expansion broodwars)
Diablo 1 & 2 (i think 1 was better)
Aliens vs. Predator 1 & 2 (gotta love that nail biting action!)
Tie Fighter,X-wing vs. Tie Fighter, X-Wing Alliance
Ef2000
Hyperblade (mad fun)
MDK 1 & 2
Superbike 2001
F12001
Die By The Sword
hmm...that's all i can think of right now (real tired). There's a ton more that i've yet to play (but i have those too! lol!) and still more that i havn't even purchased and possibly never heard of(so many games...so little time).
Alot of awesome games out there. my suggestion would be take a look at a good gaming site (gamespot,ign,etc..) and see wut games got good reviews. select a few titles that u are interested in, (always pays off to read reviews!) and have some fun!