You're overstating Hansen's skills to try to fit your narrative. He's a good, tough runner who will be just fine for us.
The problem is Penn State fans are used to having an elite RB. Barkley, Sanders, Journey Brown when healthy, Kaytron, and that's just in recent years. Forget about Warner, Johnson, Thomas, Kijana, etc. Hansen is not on any of their levels.
Can Martin reach that level? We don't have enough data to say just yet. It's that simple.
I do think some fans are denigrating Hansen a bit too much given that both Marshall and Temple stacked the box and focused on stopping the run first. I think Hansen will be solid, just not elite by any means.