I thought the second was a lot of fun.
I didn't like how over the top epic it was. I liked the sort of dirty, used look of the first movie.
Then in the second movie, he's almost like Space Conan. There was no real tension. I knew that he was so superhuman and invulnerable that he was going to win no matter what.
It even ended with him sitting on a throne like the king of Aquilonia.
I thought all the stuff with necromungers and far away space empires and pseudo-fanatical zeal for causes just felt like Warhammer 40K or something. Which is fine...for Warhammer 40K.
I watched it a second time to see if it was just me and my reaction and the second time, I just felt that it all came off as overly cheesy space opera.
Richard Riddick, space fugitive is fine with me. Richard Riddick, conqueror of civilizations just isn't the right tone for the character IMO.