If you have to criticize him, you could say that his recent movies have not been up to the bar he set in the '90s -- but it definitely was a very high bar.
I'm much more worried about Gordon-Levitt playing Snowden, from the trailer he looks pretty bland.
Also maybe relevant is his opinion not an opinion after meeting Snowden for research on the role:
> "Now, as he would say, it’s not for him to say whether it was right or wrong. That’s really for people to decide on their own, and I would encourage anybody to decide that on their own. I don’t want to be the actor guy who’s like, ‘You should listen to me! What he did was right!’ I don’t think that’s my place. Even though that is what I believe – that what he did was right.” [1]
[1] http://www.ew.com/article/2015/09/18/joseph-gordon-levitt-sn...
As another commentator pointed out, it's one of those rare situations where the real-life character is more beautiful, fascinating and tall(!) than the actor. Don't you find this a little funny/awkward?