I think most yes. But there are also enough studios where the power really comes from the company itself. EA just lives mostly of off other studios. Most developers @ EA now have always been good even before they started letting their games get published by EA
EA feels more like an investors business club that bet their money on the talented people and they do a pretty good job so far.
It's like when Vanquish and Bayonetta's succeses get praised it's Platinum games that gets most of the credit, of course until platinum decides to stay with SEGA forever(which would be awesome). Games like shenmue, yakuza, jet set, skies of arcadia is where SEGA gets the praise.
Also with Nintendo of course with their franchises. Ubisoft has rayman, prince of persia, beyond good and evil and more of it's inhouse franchises as well.
I don't really have a lot of knowledge about EA as a company, but I know few games of where I think that it's >EA's< creation rather than a studio they picked to finance their games for. I actually know none so i'd be glad to be informed.