This is exactly what game companies try to do now. Making their combat so "exciting" and "innovative" and the rest of the game is disgustingly lackluster. GW2 suffered from this exact thing. So did TERA and practically every other action-MMO in existence.
There's absolutely no debate when it comes to how polished and refined WoW's content is. Regardless if it's repetitive, the game opens up massively at endgame, which is how MMOs should be. Endgame content is what keeps players playing.
People need to stop being so concerned with how combat looks, and actually focus on how it plays, handles and the overall quality of the game. WoW is still on an entire different level to 99% of the MMOs out there.