Impact =/= great game.
Not a bad list, but stuff gets pretty arbitrary when you're comparing Simcity vs. Doom and trying to decide which is a better game.
Civ2 at #3 is nice though, that was my favorite game for a loooong time, Civ4 with its expansions and modability has it beat now though, it didn't disappoint like Civ3.
The scary thing about this list is that I've played (either extensively, or beaten, for the most part) close to 85 games from the list, with the exceptions being the arcade games, and the newer console ones.