I think it will be OK.
The one advantage of a server-side game like this is that fixing bugs is muuuuuch quicker because you only have a handful of updates to roll out instead of thousands. So once things are ironed out, I think you'll find it settles down quickly.
The whole "US region will get updates first" thing is simply not true. Although Maxis have 'regional' servers for the sake of spreading out the load, they are all accessible by everyone, and all running the same software versions, so any updates will get rolled out together. Nobody is going to be left hanging...
I know all this release drama is frustrating, but its inevitable really. Increasing capacity extensively to cater for a 5 day peak demand is just not good business sense. All this drama hasn't affected EAs bottom line, they still have your money. They have a monopoly on the simcity market!
I get the impression Maxis is a small team, with a small development budget (no EA exec in their right mind is going to risk a massive lump of cash on a game that hasn't been made for 10 years!). Based on the success of this launch and sales over the next few months, I think you'll see more resources being put into it.
It also didn't help that the US launch coincided with Crysis (or whatever it was...).
I'm looking forward to playing.