So, yet again, serious issues here. First, Mass Effect rather than ME2? You can pick ME2. It came out in 2009 and is better in every way. I mean, I'd probably have left both of them off because I consider them to be primarily console games, but if you're including the first then you can clearly include the second.
A bigger problem is that Dragon Age: Origins isn't on there. Now, there IS a game that is very clearly a PC-first game, it's a better version of everything done in KOTOR (minus the Star Wars theme), and coming out later in the decade had about as good a visual experience as you were going to get. Great voice acting, too. I know people have nostalgia for the KOTOR games, but as time went on, Bioware got better.
Portal is an obvious omission, even though Portal 2 is again better. They straddled the decade cutoff though.
But here's the biggest problem, and it's basically an instant disqualification: Deus Ex. It was released in 2000. It was obviously the best PC game of the 2000s. For the longest time it was considered the best PC game ever - most notably,
PC Gamer had it as the best PC game ever made at the end of the decade, which says something. Hell, even in the past couple of years, it's still a matter of debate for some people:
https://www.rockpapershotgun.com/201...he-conclusion/
Or, you know, if you have two hours to spend watching a review, for some reason.
Basically, regardless of how many people play WoW due to its addictive quality, it again is not actually in the same league as something like this. For me, a "best games" list is about elevating the genre to something approaching an art form, and that's what Deus Ex did. If your top ten doesn't have it, your top ten is wrong.