I wouldn't take away too much from the game. The part that annoys me most is the messages the game sends your Wii console. I'll shut the game off after playing until 11 at night to get some rest for school, and two minutes later that bright blue light flashes in my face. Then I have to go turn the console back on, go through the saftey instruction screens, click on the messages section, and delete every single "LUIGI HAS GONE MISSING!!! OH MY GOD!" There probably is an option in the game to stop these messages, but I haven't really looked into it yet.
Other than that, I can say I've been addicted to the game for a week now.