I didn't mind the first film and I don't actually mind its sequel.
These feel like the sort of flicks that should be getting 6/10 (or lower) from me but when the credits have rolled on each film I can't deny that I didn't not like what I had just sat through and watched. I haven't really got that many positives either, but rating it lower just feels off to me for some reason. It's a decent murder mystery (ha! I said the thing!)
Adam Sandler and Jennifer Aniston are a passable pairing, as a duo I don't think they are all that effective but do do the job and individually I'm evidently content to watch them act; esp. Aniston. Mark Strong, Mélanie Laurent and Adeel Akhtar are some of the others that are involved and, again, they give what's required. Akhtar's character is initially annoying but ends up being fine, and I like the actor from 'Four Lions' and (the quality) 'Utopia'.
I didn't need a secondary installment of this, yet I clearly hold nothing against it. I do hope that they don't make 'Murder Mystery 3' though... ah crap, who am I kidding - I'd probably find enjoyment with that too.