I really enjoyed it. The special effects were nice and I got a laugh when I heard the T-Rex from Jurassic Park roaring out of the black, cat-like creature's mouth. Perhaps it's not the most original story in the world, but I don't think it's a bad story either.
I can't stand 3-D personally, so I made sure to go to a 2-D showing. 3-D just never looks right to me and it makes me nauseous. Maybe it's just me...