Matthew McConaughy was amazing in Dallas Buyer's Club. And was very good in True Detective. Even films like Bernie; Mud; The Paperboy; Killer Joe; his acting was very good, so much better than that middle portion of his career in Rom Coms after A Time to Kill. His career has been on the upswing, for sure. I just thought he was prone to overacting in this film, and seemed to fall into some kind of weird mixing his more serious roles of late, with his earlier romantic comedy roles, and creating some kind of unholy and terrifying hybrid.
My only other problem with the film, and this is notable for me, as I am someone who adores long films, is that Nolan did a fantastic job with the first and last 30 minutes, but he seemed to unnecessarily ramble, and get a little lost in the middle part. The film could have been made a little tighter, cleaner, through the middle. At least, as the sort of film it is (it's not some sprawling, Tarkovsky-esque epic, so the sort of rambling, uncut middle didn't seem to fit)...
Still, I thought it was a very good movie.