That's a little bit of bull. The servers allow people to access the game, sure, but they're supposed to be reviewing the game itself, not the ease of access to it.
If it wasn't a necessary part of the game, than sure, it wouldn't matter. But when some people can't connect to the game, or lose progress because the servers a fucked up, that's entirely on Sim City because there is no game without the servers.
No, it's on EA, not SimCity. The game itself is still a 9, according to Polygon. This would be like rating Call of Duty (pick one, any of them) and giving it an 8, 9, or 10, but then lowering it because the community is bad. The game itself is great, but the things surrounding the game ultimately cause it a lower score? That's something I expect from crying fans a la DMC, not so-called professional reviewers.
Except that's not like a bad community at all. The servers are required to play, a nice or mean community is not. The servers don't surround the game, they are the game. It's unfortunate because if that wasn't the case I'd agree.