Agreed that the Packers can do better than McDuffie. I don't know Campbell well enough but I take your word he's a first-round talent (but what were his parents thinking when they named him?).I like Jihaad Campbell in the first. Anyone who can improve the pass rush and get to the ball faster is an improvement. I like several LBs projected throughout the draft. I don’t care for McDuffie. There’s enough talent in this draft to significantly upgrade that position.
Cooper is the anchor of the LBs now. I'm all for putting more talent around him, or seeing if Hopper can be that guy. Anyway they can increase pressures on a QB - it's certainly a need whether it's at LB or Edge or both. This draft does seem pretty solid at DL, Edge, and maybe LB. And there appears to be a lot of value in rounds 3-5.
As for Quay Walker - he improved last year, but has to get better. If Cooper turns out to be a rusher, maybe hold Walker back to defend the run and drop into coverage, two things he's good at. No reason he can't be better with some coaching and teamwork.