Well as someone who played WoW largely solo against bots, I don't think Evan's example is necessarily a good one.
Calling computer controlled units "bots" would be like saying Galactic Civilizations is just playing against bots (which is technically true).
I know I find the single player tournament enjoyable.
For me, single player is important because multiplayer is usually against anonymous strangers. Demigod will do a lot to rectify the things about multiplayer gaming that I don't like but still, you have to have a decent single player experience IMO.