When I first read a comment from Reynolds that his suit was going to be CGI, I kind of had a panic moment. But this looks interesting.
Still, I would think being in a superhero film, one of the coolest parts would be to actually put on THE suit to help become the hero. Just putting on a blue spandex jumpsuit so they can CGI in the cool stuff later wouldn't quite cut it...unless, I guess, if you were Superman.
It's like Thing vs Hulk. I never cared for either Hulk, but put Michael Chiklis in the Thing suit and I thought it was a well done performance. Same with RDJ, if he didn't actually get in the Iron Man suit I think something would have been lost in the performance.