If you're comparing Perry to Harrison because of how much they sucked to begin their career you're saying Perry's expectations should be that of an undrafted free agent instead of a first round draft pick.
I said Merriman because he was an elite athlete in the same mold drafted to play the same position with the same weaknesses. Nobody cared if he could cover or not. My point was that saying Perry is misused implies there is a good way to use him which I don't think is true. A pass rusher whose ineffective rushing the passer isn't misused, he sucks.