What the other games provide that this one doesn't is quick, relatively even number, round based action. You click on an arena, they throw you into it when it has enough numbers, and you do your thing. A good number of things on the wishlist in here are centered around the idea that's how gameplay should be.
I'm glad AH doesn't do that, because I much prefer a sandbox with more unpredictable stuff going on in it. The unfortunate thing is, it's a gradually shrinking niche market.
The vast majority want something they can hop into, get a fair fight, and accomplish an objective within around a half hour or so. Hence why games like WoT do so well.
Wiley.