I think the lesson SR learned from Matrix is full CGI shots of flying are good for very fast scenes where people won´t pick the details so much, but for a shot where you actually get to see the character green screen is better. I didn´t see anybody so far complain that Routh looks like a "doll".
As for Routh, like I said other times, it´s all in the performance. Whether he may have seemed too boyish or not in pics, you forget it when you see that intense heroic look on his face. That´s someone determined, focused, who knows what he´s doing, not some confused angsty kid.