Well, I had a good opportunity to watch it yesterday and I decided to give it a try. I don't regret it. I don't think it's a great film, but it's a nice and fun family movie. It felt more like a christmas movie than a summer one (not only because all the snow and cold weather), but no big deal. Jim was as Jim as ever and everyone else was OK (I did get a bit annoyed with the "I'm mad at you for no particular reason or for reasons that aren't actually your fault" daughter).
I don't really know how accurate it is to the book, but the story offered nothing new. In fact, the elements surrounding the main plot point are very, very similar to those of "Liar Liar" (divorced parents who get along well, kid/s who get them together again, crazy rescue at the end), and I'm not sure those were exactly 'new' in "Liar Liar" either. And then, some jokes worked for me and some (not as many) didn't.
All that said, I can say I actually enjoyed the movie. The trailers didn't make it justice and I'm glad I didn't skip it while it was in theaters (I WAS going to buy the DVD, anyway). If you are on the fence of watching this like I was, just go. If you are a Jim Carrey fan, and if you're here you should be, he alone makes it worthwile.
Now let's do that Dumb & Dumber sequel, Jim!!
