I have an iPad Air and iPad 3, both VZW LTE and both running 7.1.2. Regarding the iPad 3, I installed iOS 7 right away but wasn't happy with it until 7.1 came out. I'm satisfied with iOS 7.1.2 on my iPad 3. There's only one app on the iPad 3 that sucks for me, but it's just a time-waster game - and I really don't know if it would have worked on iOS 6, and FWIW that same game makes my Air REALLY warm. I keep the iPad 3 as its much better than the Air with the styluses I use, I have a few accessories that are really handy, and it's built like a tank.
There's a "but" to this from me, though. I'm a small dev and will have access to the iOS 8 GM when it comes out, and will install it on my iPad 3 - I haven't installed any of the iOS 8 betas on it yet. My "but" to you is, with iOS 8 coming out soon I'd hold out until it comes out - Apple will likely stop digitally signing iOS 7 shortly after iOS 8 comes out for capable devices, so, if you're happy with iOS 6 on it, I would leave it that way until more feedback comes out on iOS 8 installed on the iPad 3. I did install B5 on one of my iPhone 5 handsets, and it worked really well, but I've restored it to 7.1.2 in anticipation of the iOS 8 GM being made available soon.
Short answer: I wasn't happy with 7.0 on the iPad 3, but it's a non-issue now. I'm glad that I installed 7.1 on my iPad 3 and wouldn't go back to iOS 6, even if I could. 😉