I bought
Professor Layton on Sunday. I've played about 3 1/2 hours and solved around 55 puzzles. It's obvious at this point what's going on with the town, and why it's so strange, but it hasn't actually been solved yet.
Anyway, in my opinion the puzzles are way way too easy. Then again, I know it's a game, and probably for kids. I'd rather have a game with puzzles ten times harder where you don't lose the ability to get all the points if you guess incorrectly. Then again, I'd prefer puzzles that have a lot more than four possible correct answers so that isn't necessary.
These are just some first impressions, anyway. Maybe I'll feel differently once I finish the game. Anyway, at this point I won't be buying sequels. It's just too simple.