I haven't had any issues connecting to and using my WiFi connection, except for this relatively minor quirk.
Every time my phone has been sitting on my desk or whatever with the screen off and I pick it up to use it, I see that it has switched automatically back to 3g. Within several seconds of turning the screen on and unlocking the phone the WiFi will reconnect automatically.
Why isn't it staying connected to WiFi all the time?
I can't think of any legitimate reason why it would switch back to 3G when the phone is idle other than attempting to use up as much of my data plan as possible. I know that is a bit paranoid but my previous phone was an older Razr where you couldn't even get the pictures off it yourself because Verizon thought that would be an easy way for them to make more money, and you can't check your voicemail without calling in and using your minutes, where they make you listen starting with the oldest message first, etc.