People tend to post when they have problems, not when everything is fine. You're seeing very, very skewed results by going by these forums. There's always going to be some problems, yes, but trust me...there's many, many people NOT having problems with their phone. You're just seeing the (very) vocal minority.
Plus, people here at MacRumors seem to be way more fussy than most people. Some of the threads for people wanting to return their phones are ridiculous and not because there's anything actually wrong with the phone.