It was a lot better than I thought it would be. The trailers made it look like it could either be good fun or really, REALLY bad. Thankfully it was the former.
As someone who grew up with Robin Williams' Jumanji and liked it, I didn't think it needed a remake, but they did the source material justice and the cast was good. Jack Black was funny, The Rock was good in it (I do enjoy watching him in most movies even though I hate wrestling) and it was nice to see Karen Gillan getting a bigger role.
I wouldn't say it was "so, so good." It's not great, to me. But it is good fun and a pretty good movie, especially as far as remakes go. It starts better than it ends.