This game is great., but for one reason only.
Visuals - OK
Gameplay - Repetitive
Difficulty - Easy
What made this game for me is the co-op. I've been gaming since the days of the atari (nearly 30 years...wow). I have a 6 year old son just getting into gaming and he likes to play co-op games with me. The problem is, local co-op games that are easy for children to play are thin on the ground - even the lego games will penalise you with loss of studs when the inevitable death comes along. In this game, it doesn't matter how many times your partner dies. As long as one of you keeps it together, you'll progress and get those achievements!
So, for the single fact this game is great for a parent and child to do a bit of bonding, without the frustration of you expecting your 6 year old to suddenly turn into an uber gamer, I give it 4 stars.
If you don't fall into the category described, you won't like the game. Unless you play for points. In which case this is an easy 1000 points.