What class are you? I would recommend starting 3 or 4 and getting each of those to level 10 before you decide to choose your main.
I started with a Warlock as my main but had a Shaman and Hunter to try out also. I found the warlock to be sort of repetitive so at level 20 I stopped playing him and found the Shaman more enjoyable. So yea, try out a few classes, it's hard to tell how good they are until level 20-40, but even getting them to level 10 should give you a little idea








