I don't have trouble getting online, but I do have trouble connecting to certain friends. Its that stupid NAT thing. It won't let me connect to friends who has Strict or Moderate NAT.
I don't have any issues when using either wired or wireless. My only issue is a clogged bandwidth. So I may disconnect at some point for a few seconds.
The only time we've had a problem was when we first moved here and got set up. We had to change some ports on my husbands computer so that we both weren't running from the same game ports. Ever since then, it's been pretty smooth.