Yes, I'd agree with that... in his early-mid career he was average.
He was always slow to react and completely lacking in instincts, but he was fairly steady and stayed healthy for the most part. From the git-go we all complained about all of his tackles coming 5-7 yds downfield. The guy just never developed any instincts for the game.
At this stage, he's a wasted roster spot and doesn't belong on any NFL roster.