I think the main issue with the computer graphics on the Ryan Reynolds costume comes from it being early days in the use of that technology for costumes on real live human beings in movies. It's done all the time now in super-hero movies and it's often invisible to the audience. There are a lot of computer graphics that we don't notice--it's only when they are obviously computer generated that we notice them and they become a matter of discussion.
The funny thing is Reynolds was one of those actors known for having a ripped body. I could see using graphics or padded armour on actors who weren't ripped. With Reynolds, they should have used body paint and had him do his scenes practically naked. I'd say the same for Henry Cavill. What's the point of hiring actors that look like Greek gods if you're going to cover all that up with plastics and special effects?