As for some of the things that I'm not too keen on, well, let me think. I'm mostly fine with the camera. Takes a great pic, but sometimes isn't as responsive as I want it to. Example, yesterday I was at a bar and a friend was singing karaoke. Pix were coming out fine, but just not responsive enough. I normally just say "shoot" and it takes the pic, but I knew it wasn't gonna work in a loud bar. That and I'm holding the phone above my head, so I'm pressing the thing. I took about 8 to 10 pix, but only 4 actually took.
Also, voice commands need work. I think that's mostly just a limitation of the technology. Apple has created this illusion that voice commands are some place that they're just not yet.
Also, the keyboard. It's not Swype. I tried Swiftkey and was kinda like, "Why do people like this?" Didn't give it much of a shot, though, to be honest. But anyway, the keyboard on here is better in certain ways, but way too often it's incorrect, or just flat doesn't respond at all to what I've swiped.
LauncherPro Plus doesn't seem to be stable on it. I know that's more on Fede than it is Samsung. I'm trying Nova Launcher now. It's nice, I do really like it, but I miss having a custom dock and their widgets just work better than APW.
All the lil tricks that this phone does seems to need work, too. The tap the phone to go to the top thing seems hit or miss (pun kinda intended). The phone hasn't once stayed awake while I've been looking at since I enabled the setting. The shake phone to rearrange the homescreens rarely works. The unlock saying I setup hasn't worked hardly at all. And I know there's more but I can't think at the moment.
None of these issues keep this from being the best phone on the market, though. I'm overall very happy with the phone, and trust that just about everything is something that can be addressed in time.