I can't help but notice a whole era missing in PC gaming. They start it in mid-90s, but a lot of great games were done in the 80s and early 90s, including the whole adventure genre. Where is King's Quest, Space Quest and the like?
Also they have a bit of an issue with naming. 8-bit was 70s, not 80s -- that was 16-bit, while the 90s introduced 32-bit games, at least on the PC platform. (Anyone remember Watcom's dos4gw? Doom used it for example.)
Ah, and it's open for voting now!