The good thing I've heard about The Sims 3 is that it's much less system requirement intensive
The system requirements are low, but not that low. People who have been playing the "unoficial previews," have all reported frame-rate drops during certain gameplay events.
Of the big three, EA is the only one left with cred amongst most hardcore gamers.
It'd probably be EA > Ubi > Activision at the moment. Even I was loathe to admit that EA has gotten better since Ricatello took over.
Nowadays, pretty much every gaming house has better rep among gamers then EA. I would say Valve and Blizzard stand at the top, in terms of reverence from gamers.