This doesn't deserve a whole lot of time, so here are the basics. The character of Bernard changes from a strong-willed, lovable supervisor to a wimpy, whiny dweeb. The reindeer actually talk (or mumble, actually), a horribly contrived tool that doesn't work at all. We're asked to believe that elves that are over 1,000 years old can't handle things at the North Pole without a stupid toy copy of Santa around to be in charge. The extent of Charlie's misdeeds are terribly downplayed (spray-painting an entire wall of a gym and spray-painting lockers on school property would probably get him jail time, yet his dad begs the principal not to suspend his son). There are many more, but again, this doesn't deserve the time.
All in all, this movie misses the magic of the first. There are none of the magic, tender moments such as "You said you were lactose intolerant," or great moments as when Bernard tells Santa about the list, and all of the elves sing the third line of the song. I have to say that if you like this one, you're very easily satisfied with a very poor movie. They should have burned this script and found another director.