"He plunges into a hundred foes without thought, but before marriage he stands frozen with fear! And there are those who say he is not yet wise!"
The movie is mildly entertaining, with some decent action. Plus, but Jake Gyllenhaal is amusing and Gemma Arterton is hot.
It's unfortunate that the time-travel element is completely squandered. The story is pedestrian, and the whole thing gets more ridiculous as it goes on, with a CGI-laden climax and predictable ending.
Taken all together, there are certainly worse ways to spend an hour and 56 minutes.