I really enjoyed this game. Combat is awesome, especially when fully upgraded, story is good, the reveal at the end really surprised me. The only minor thing I was disappointed in was that there were all 9 realms listed and you can't visit them all. Just leave them out instead of getting my hopes up. Or mabe an expansion is in the works, I don't really know.
Side note:
I visited Muspelheim early in the game and didn't like it so I didn't return until I had already finished the story. By then I had every skill for all weapons unlocked except the last blades skills which are locked behind completing Muspelheim. I actually felt like a god there. I was so overpowered that I demolished the first four arenas without my health going below half. That was a ton of fun, unlike my first visit which was frustrating and annoying.