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I actually liked WoW's combat mechanics. The biggest gripe I had with WoW was their cop-out on the one thing that distinguishes an mmo from a single player game: World PvP. Instead, they went instance crazy in both pve and pvp. Blizzard preferred to take the cheap way out and siphon everybody out of the world pvp with much more lucrative rewards in instanced Battlegrounds. Granted, there are some who prefer the instanced combat. But I suspect that most recognize that the true value of an MMORPG should be in the "massively multiplayer online" aspect of the genre. That's what sets it apart from your standard single player rpg. That's why you pay a $15 a month subscription vs. a one time purchase of a single player game.
Second, the game lore was pretty dull. I suspect this was part of the reason why a large majority of players' primary reason for playing was for the phat lewts and status. If there was something compelling about the game lore or its mechanic, things might have been different.
I believe that Bioware could potentially set itself apart on the above two points from WoW. To me, that's more than enough innovation and change to bring a massive amount of people to the game and stick with it. The details of the combat mechanics are such a minor consideration compared to the above two game mechanics, as far as I'm concerned.