Paladins everywhere on diamond. The only time I've gotten legend was with pally so I wanted to have fun, climb and try to make legend with a different class. So I try deathrattle demon hunter, primordial druid, rush warrior, and control warrior (don't have Rinling's rifle so havent tried face hunter); all steam rolled by paladins. The moral of the story is if you want to play in diamond and win on consistent basis, there is only one class. If you can't beat them, join them.
Winning > trying something different.