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I recently finished downloading warhammer online, and had a chance to feel it out.
What you will notice is that the game plays a lot like world of warcraft, which is not necesarrily a bad thing. If you look around forums people will critize the game for this, pointing out that even the graphics look a lot like world of warcraft.
But what needs to be known is Blizzard actually wanted to buy the warhammer engine, and when they were turned down, they set about creating an engine exactly the same. I've talked to a few people and none seem to be aware of this information, which I feel is incredibly important.
Take it how you want.