They didn't need to pull from the original film so much with some of the same gags and another song and dance sequence (which was drawn out), but it was a good story and a good movie with old and new characters. Although some things could've been cut. Like the ex wife who seemed important and threatening but ended up not being either. The Dads (Lydias) presence in the film could've been cut entirely. Overall, it was entertaining and a better sequel than most iconic films get.
Why Bob, though?
I'd watch it again. It'll probably grow on me. Which is why I gave it 4 stars.