All of the game's characters are faithful renditions of what you see on the big screen. While the quality isn't as high-quality as what is seen in the movie, it is pretty close. Characters are detailed enough that they showcase some of their personalities. Even enemies showcase a bit of personality, such as the 'West Side Story'-like Merry Men (of Robin Hood fame). There's nothing more intimidating that a group of men in green tights armed with three years of jazz and tap lessons.
The biggest complement I can give the game is that the levels are massive and do a great job of leading into one another. You actually feel like each area is connected to the last, but at the same time they feel like their own little areas. Every area of the game has some kind of story book tie in and while it doesn't feature as many in-jokes as the movie, there are still a few chuckles to be found. A number of landmarks from both movies are also present in the game. I even caught a glimpse of what looked like Farquaad's elaborate tomb from the Shrek 4D attraction at Universal Studios.
None of the actors from the movie reprise their roles in the game. The stand-in voices do an excellent job overall, though the lines come up a little too often and get old. Younger players may enjoy it more, but I got a little tired of hearing Shrek comment on his bodily functions every 5 minutes. Some of the familiar tunes from the movie are present, as are some more original tracks. These are well done and fit the game's environments nicely.