My feelings about that Flintstones movie are more along the lines of a love-hate kind of thing.
It's certainly not a bad movie at all, it definitely came from a time when modern remakes of nostalgic franchises were actually good... and with the possible exception of Rosie as Betty (she wasn't bad, but she wasn't good), there really isn't a sour note with the live action cast. However, for some reason, at times, I just can't bring myself to watch it, for whatever reasons, I honestly don't know why.
As for Viva Rock Vegas... ehh, that one was a bit of a let-down.