I think it's a great fit actually. I know most of it is coloring (and I'm not sure if he does his own coloring but I doubt it), but his "glowing" effects always look great. I noticed them a lot in his work on the 7 soldiers Mister Miracle mini. I imagine we'll get a lot of that in Thor. Cool.
Everything about this book is great. The art and coloring are gorgeous. Fraction writes the characters pitch perfect and he's clearly setting up a lot of things to play out down the road. As for the villains, I have no problem with them being mysterious for the moment. They haven't stepped into the front of the story yet. I'm willing to give them the benefit of the doubt because they're clearly being given a slow build.