Really fun movie.I'm glad it brought the franchise back to basics after the overblown COR, without abandoning the mythology of COR (and Pitch Black). It seems like two different directors did these films, even if Twohy's trademark dutch angles are all over this. To me this is the most ruthless I've seen Riddick in the series thus far. I will say the ending was anticlimactic but that's a small gripe in thoroughly entertaining film. If there's a sequel, I hope they keep it small and Rated R like Pitch Black and this.
Sidebar: I'm finally glad we get to see Katee Sackhoff's jammers. And they were worth the wait.