I had read that in some reviews that it was very similar role to Shutter Island. Di Caprio is one of my favorite actors due to consistently solid performances but also the roles he chooses to take on. But I agree it would be nice to see him to something a little different now and a comedy could be a lot of fun. I don't know that he has every really done a comedy or at least not in a long time. I guess Catch Me if Yo Can was kind of a comedy in some places and I thought he was great in that.
I've been (unrealistically) hoping that since Nolan seems to like to reuse actors in project that Leo would be in the next Batman film as a villain. I think it would be fun to see him play some eccentric version of the Riddler, I'm not that familair with other Batman villains but I'm sure that there are more that would be fun to see him play. I do think that is pretty unlikely though, I think it has been since 2002 since Leo was in a movie that he wasn't the male lead in, so I'm not sure if he would take on a supporting role like that.
Anyways I'm glad you enjoyed the movie despite your minor disapointment in the sci-fi elements, and I'm looking forward to seeing it soon.
