Honestly,I don't. I love it's apps, I love it's games, I love it's Cross buy/Cross play, I love it's price drops on games, I love it's functionality. The games ( Well most of them ) Have been top quality, free games are being annouced almost all the time. It promised Console quality,and it's mostly done that.
I play the Vita more then I do with my PS3 and Xbox now.
Only legit complaints I have are it doesn't have the ability to download PS2 games,which I know it can run, rather short battery life when playing games, and the camera is bad.
No. The Vita is at least as good as I expected it to be. I'm looking forward to more AAA games in the Vita library, but I have no significant complaints about the hardware or the System software.