I think he looks skinny, not muscular. That's my opinion. I posted a pic of an actor who I thought, (at least in 1985), HAD achived legitimate muscularity, how is that unfair? Pitt's arms don't look like they measure above 15", he has a skinny waist and chest, no traps. Would I like his low bodyfat percentage, sure, but not at the expense of hard earned muscle.
I just don't see the unfairness. I thought about posting my pic, but I'm not sure I would get a fair appraisal, as opposed to people flaming on me.