I think if you got an athletic body, show it. But not show it to the point in which the seams are stretching and breaking. :-)
So, wearing athletic-fit clothing instead of the pillow-case look that most conventional manufacturers have is good. And, burninman, you sure look ripped to me.
But I agree you need to pick and choose.
For example, some of UnderArmour's athletic gear is so tight, that to get that "athletic look" I have to buy XXL (I'm 41"c, 30"w) and it still looks "fitted". On the other hand, they have a series of short sleeve conventional sport shirts...and if I buy a large, it looks like a pillow case on me...so I buy a Medium.
And so on.
To summarize, you don't need to look like a twink wearing shirts much too small for them, but wearing stuff that highlights your definition, and athletic frame is fine.
(*My guess is that the current style of wearing shirts NOT tucked in is a nod to overweight people...since that flouncy "look" hides many a spare tire.) :-)