I had never watched it until a couple weeks ago, when it came on TV, although I don't remember which of the Disney channels it was on. When it was released I heard comments about it being boring, so I never bothered to watch it.
I think they expected it to be funny because I remember the "I have a big head and little arms" line being in trailers. If you went in expecting humor and talking dinosaurs, yeah, a lot of the movie would have been boring.
Anyway, it was awesome, and my kids loved it too. We've watched it several times since then.