Maxis apologized and claims that on March 18th they'll be giving a free game to everyone who bought Sim City and went through this. Of course, they don't say what it is, so expectations on that front should be low. They also claim to have more than doubled server capacity and are still adding more, which I guess is making the game more playable already (they claim to have reduced 80% of the "disruptions" so far if they're to be believed). Apparently they expected beta numbers of people but wound up with release numbers of people, duh. Of course, I have no proof that it's actually more playable, but since the statement came from Maxis rather than from EA I actually read it.
I was really torn about this game a month ago. I didn't like EA, Origin, or the DRM idea at all, but I love Maxis. I figured I'd eventually buy the game anyway since I'm a Sim City junkie, so in the end I decided to support Maxis and preorder the game to get the in game bonuses for doing that. I didn't really expect the launch to go smoothly but I also didn't really care. Online launches almost always suck and get ironed out in a month or so. I bought the game for the long term, and didn't even really intend to dig into it until April or something. It's sad, but I own the game and I didn't even realize the problems were as bad as they were until I saw the fan upheaval. I've only tried to play it twice, and both times were during a low server load I guess because it worked just fine for me (I suppose 9 AM will do that).
I'm still going to try to avoid most stuff that has anything to do with EA, Origin, or single player DRM, but I also decided not to let that spite stop me from supporting the developers I love who just happen to be stuck with crappy publishers. I think it's a really good game when it's working. I also don't blame Maxis for the problems, so I still love them. Some people would get mad at me for "enabling" EA to pull this crap, but I figure as long as I reject most of their other titles on principle that'll be a good enough statement for me. So far, Dragon Age 2 is the only other Origin game I own (dunno what I'll do about DA3 yet).
I'm probably in an extremely tiny minority of people who don't regret buying this game. I'm confident that I'll enjoy it for a long time and get my money's worth out of it in the end, so I haven't even considered seeking a refund.