I'm sure LOTS of people are not having significant issues with their phone.
If you live in less populated area with a AT&T cell tower near by, the antenna issues isn't going to happen no matter how you hold your phone
If you don't use the phone all that much, odds are, the proximity sensor issue hasn't happened yet.
You might have gotten lucky and none of the iOS4 bugs happened yet (and even if they did, they're not a big deal for the most part).
It's a great phone overall, unless you're a heavy user or live in a populated area, in which case, you're likely going to have some annoying issues.