ponyo
Lifer
I've personally handled the Vibrant and Captivate and they both felt like cheap plastic. I know its whats under the hood that counts, but I guess I'm too used to the steel brick that is the Droid 1. The Epic 4G felt a little better, but its because of the keyboard.
It's because you're used to holding a brick in your hand and to your face. Lightness is a plus, not a negative.
GPS and battery drain issues are real negatives and Samsung deserves bigger beating than they are getting. People made big deal out of iPhone4 antenna issue. GPS and battery drain problems are much worse. My GPS is fixed with Bionix 1.91 custom rom along with the battery drain problem. Google location based services work every time. But I shouldn't have to use custom rom to fix something that should work perfectly out of the box. Samsung released and sold 5 million of these phones knowing about the flaws.