I don't know if Stevens is the most hated Seahawk of all time, but he's probably at least top 3. For good reason- he was a terrible person off the field and inconsistent on it. Then again, he was a pretty big part of our SB run, and he was strong in the red zone for most of his career. I thought he was a really good blocker when he wanted to be, and I still think he's the most physically talented TE we've ever had. And though his statistics weren't great, he had the best statistics of any TE we'd had up to that point when he left in 2007.
Kinda hard to look at the body of evidence and think most over-rated. Most hated, sure, but definitely not most over-rated.
I'd also defend Lofa. He was a damn good linebacker until the injuries started rolling in. Granted, you wouldn't expect an undersized LB to stay healthy forever, but had he put up 10 seasons like his first 3, he'd be a slam dunk HoFer. For all the love Chad Brown (deservedly) gets, he never had a season that impressed me quite as much as Lofa in 2007.