Honestly, an adaptation can only be better.
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Well, whatever they do, they should not go back to Orcs and humans. Despite what blizzard says and it working on a game, by now it's an old and tired trope.
Warcraft 3, please. Bring the burning legion in.
Hmm... thinking about it, the one role Chris Pratt could fit is Varian. I guess that could be ok.