The game does a reasonable job at recreating the world from the movies, but the levels are very linear. Unless you're obsessed with increasing your coveted gamerscore, there isn't much reason to search out all the hidden items or find the sometimes devilishly hidden secret crayon drawings of Shrek doing things he's already done in the game. Yes, those are what they sound like.
There's really not much reason to recommend Shrek. It's possible a six-year-old could be amused by it, but at E10+, they shouldn't be playing it. And anyhow, there are plenty of other kid-friendly games that will challenge their brains and inspire their imaginations. And make them actually laugh. this one scores a point higher than the Wii version for being prettier, but that beauty is still only skin deep.