I mean the combine does raise legit questions, but let's be clear Charles Harris was drafted to be a pass rush specialist early and the hope becomes he develops into a good run defender. The one thing you can say is that it's not disinterest, he will over pursue (something Cam Wake still does quite a bit) and there are some times where he just didn't bring the player down (which is another issue). But in terms of pure pass rusher? Pretty good.
I just looked at 5 different scouting reports and got a different player comparison for each; Connor Barwin, Jerry Hughes, Shane Rey, Ryan Kerrigan, and Mevlin Ingram. If he became what any of those players became we'd take that no? Now granted he could become a Bjorn Werner too but I think the biggest difference is explosiveness.
At the end of the day, I don't think we have to worry about him being Dion Jordan which is great