Yeah, Ok. That's how I see it pretty much. I mean, he is big and fairly long, but he just doesn't strike me as this run/jump uber athlete.
But as you said lightspeed5, "quick" and "nimble" are viable athletic traits as well. Pierce isn't a jaw dropping athlete, but he is certainly a great athlete in terms of strength, footwork and deceptive quickness on the drive.
Likewise, Bird wasn't a "run/jump" athlete, but he certainly was a great athlete in terms of strength, deception and hand/foot speed, court vision.
I guess if Melo figures it out, he could be something special then - or at least he has the physical tools to be...