What's the knock on Preston Brown?

[BengalD]

So after reading the article on Preston Brown this AM - I'm asking myself - what's the knock on Preston Brown?  With this guys credentials - why would the Bills let him go?  Now - If everything is as great as the Bengals.com article reads I'm actually kind of stoked about the linebacker situation - post suspension games.  To have Tez, Brown and Vigil on the field at the same time might be close to having the best LB tandem in the league this year.  Thoughts?