Expendables 2
I thought both of them could have been better, but Expendables 2 as by far a better movie. My largest complaint with it has to be that the script had some rather cringe-worthy attempts at humor. They really need someone to read over the script next time and help with their comedic timing, because it was pretty shitty in a lot of places.
Does Bourne have anything to do with the previous movies?
Sort of. It takes place during Bourne Ultimatum, but it doesn't really deal with Bourne himself. It adds to a tiny bit of the story past Ultimatum.
EDIT:
I described Bourne Legacy previously as feeling like more of a Bond movie than a Bourne movie, but with a drug addict as the lead.

"I NEED MAH PILLS!"