Just wait till you get to Northrend! Beautiful in my opinion.
My main before prepatch was a hunter but they honestly feel a bit too clunky to me with the changes. I've been in the beta for Legion since May and I'm really leaning toward Demon Hunter for my main. Loads of fun.
I do know that there have been performance issues related to some specific graphics cards (and a lot of NVIDIA ones) that the team is looking into. Otherwise I'm not sure if its a bad thing that 10 year old computers are having a hard time handling graphics updates. Though maybe there should be some configuration option to go even lower to make it easier on those machines.