I saw him in 50/50 last night and I actually enjoyed it.
It was a simple film, aimed at a broad audience but not an easy subject to discuss. I was just impressed by the acting of the entire cast. It was an hour and a half long, with a clear story line, interesting characters and didn't spill over into schmalz too much.
JGL: Clearly can act, but also sparse with his acting. I liked him a lot and will look for other films he is in now.
Seth Rogen - what a surprise! I thought I would hate him as the "comedy turn" within a cancer drama, but he played it very well.
Anna Kendrick - again, a complete surprise. Playing awkward and "unattractive" very well and despite me having some reservations about the character, very believable.
JGL is firmly in the "interesting actors" part of my brain for now.