Part of the deal on Collins is he is double-teamed on basically every play. If he isn't double-teamed, he pushes the blocker back several yards and gets in the quarterback's face.
I'm not trying to say he's on Suh's level but here's a little comparison:
Collins - 2014 - Soph - 45 tackles, 14 tackles for loss, 4.5 sacks, 13 quarterback hurries
Suh - 2007 - Soph - 34 tackles, 6 tackles for loss, 1.0 sacks, 4 quarterback hurries
Suh - 2008 - Junior - 76 tackles, 19 tackles for loss, 7.5 sacks, 7 quarterback hurries
Again, not saying Collins will get to the same level, but his stats compare favorably. He stats from his Sophomore year are much better compared to Suh's sophomore year and not that far behind Suh's Junior year. Not as many tackles but pretty comparable other than that. A sack, a hurry and a few tackles is a pretty good game for a DT.