BW has been a stud LBer for much of his career. I've recently re-watched him in some games vs. the Rams and he didn't look great at all. He reminded me of MIcah Kiser - often one or two steps lates to the RB.
As Youngblook showed having a lot of tackles isn't a bar of performance, instead tackles for loss, broken up pass plays, sacks, and INTs are better performance indicators.
I didn't see a LBer to be feared. Certainly he was great at one time, not anymore.
That being said, I have a lot of confidence in McSnead and there's no reason to doubt their ability to hone him into a bad-ass LBer for the Rams. BW could have an all-pro year this next season just because of his new environment, coaching, and teammates. I actually expect him to perform better this year than his last yr. in Seattle.