I honestly don't think any other rookie has had the same impact Donald has. Not even Gaines, who I am extremely impressed with.
It's the way Donald is doing it that sets him apart. He bursts through blockers like an effin running back, into the offensive backfield with short area speed and strength that are shocking. I haven't seen a DT do that since Sapp, personally. And I actually think he may be quicker and better than Sapp. Which blows my mind.
I bought his jersey the day it came available online. I had big hopes for him, but the dude is better than I expected him to be. If they had started him in game one he'd probably have another 4-6 sacks and even more TFLs. Straight up freak, he is a rare player not just one that is accruing great stats. He's gonna be doing this for a long time, barring injury of course.