My family liked it, but are HUGE Narnia fans. We saw the movie on opening night at the 3 story theater in DTD. Cool. Sorry - off track - we liked the "exhibit" but I'd say DON'T wait very long in line for it. The movie trailer is pretty lame.
Here's what we liked - walking through the wardrobe, looking around "Narnia", seeing "the" lampost, and the white witches wand on display at the end (That was VERY cool).
I think it would be MUCH better without the movie trailer.
If you have time and there's no wait, sure, walk through it, and don't expect much. If you don't want to "waste" time, skip it.