When it comes to movies, the original is generally better than the sequel. That doesn't mean that sequels shouldn't get made or that sequels can't be better than the original, but in general, it's tough to top the highs of the first movie.
Still, we all know the reason that sequels really get made: money. There's no shortage of underperforming sequels out there, but there are also sequels that outperformed the originals at the box office.