frankly I was just surprised he could SING! and I do think he can it's not easy to be as fluid and strong and consistent with your voice when you DO sing, lords above and below knows I can't manage it for a whole song.
I do admire him for it though
RDJ is one of my favourite actor's, not because he can act (though that does help) because he's honest about his mistakes and quite open about them. he's very much a 'hay look at me, I was a screw up but I pulled myself up and now I'm kicking ass and theres no excuse for you not to do the same' I don't denie he had help but it was his choice to get clean and do something positive with his life. Not many actors can do that, especially in the acting industry.
also he loves cats