I wonder how many of these posts are trolls? I haven't had any issues whatsoever with 4.3.1.
Seems odd to assume that you have seen no problems there are no problems to be seen.
My battery life is good, I don't have dropped calls (mind you I never did on any phone), and most things are fine, but I get the problem in the Photos app where the camera roll gets stuck under the album bar, and you can't select it. OK, you can get round it by quiting and restarting, but if I was happy having a work round I would be using android