All I know with regards to online is I don't bother with wireless, it works great with the cable....
Why should you regret it? The 360 has great games...both old, new and whats to come in the future, I mean you can get AAA games like Mass Effect and Forza Motorsport for under $20...
Future games to look out for? Alan Wake, Mass Effect 2, Halo ODST, & FM3 for starters, we'll see whats announced at E3....should be exciting...
Enjoy your 360...