Because honestly right now, it's looking a little generic. Standard space stuff, with sci-fi elements that don't look anything special. Monsters look pretty uninspired as well.
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I thought the same thing- about how it looks like more Halo, but with more options and some magic and... Well, I enjoyed pretty much every Bungie game I played. Except for Oni... But I won't get into that... Personally, I love sci fi! So this just seem like it will be a good fit for me. I do, however, really, really wish this game would have gone with more RPG elements. That's just me though. I love RPG's.