I watched it and really liked it. It is very faithful to the games. Most definitely one of the better game-movies!
Somehow it is really charming for me to see the Professor and Luke solve all these Puzzles. But I also think that in games the Layton-story is even better, since the mystery unfolds in a way bigger time-frame and therefor is even more dramatic/thrilling, since there is this building up til the conclusion rather then having the solution withing 90 minutes... Still a very nice story overall.
BTW I also really really liked the dub, which I would have never thought, since I found it to be OK in the games but with animation the dub was really good!