I think the difficulty is largely dependent on what classes you choose to play as. I can imagine a pair of generalist mages absolutely wrecking everything in sight.
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Anyway, I'm loving most everything (that's there) in the alpha, but there is one thing that bothers me: the tombstones. What's the deal with them? They look so goofy, and the fact that they randomly spawn to replace corpses is really immersion-breaking. I'd think they were place-holders for something, but they're fully-realized art assets. If they don't serve a gameplay purpose, I think they really should be removed; and if they do serve a purpose (like being a target for resurrect abilities) they should be replaced with something less ridiculous.
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Also, has anyone been able to make that "bloody mist" thing? I thought it was fire spell + blood pool?