I have done online gaming over wireless without too many issues, but obviously, it will be slower than an actual wired connection. Though I think you will probably be fine using wireless for multiplayer.
I have waited this long, what's another couple of months. Then again, I still don't know if I want a 360 or a PS3. I mean, sure the PS3 has no games at the moment, but that will change in the coming months. The 360 has a huge selection of games but scary reliability. So, I am still getting no where.
I personally don't think any of this makes any sense. You can't just state that one series is about the cars and the another about the drivers; where's the reasoning? IMO, any racing series involves the driver skill and the vehicle's pace. One is nothing without the other.