If you can give him some cover and the freedom to just go inflict hell on his matchup, he's fine (think the Pens game from after we traded for him) but I don't like him as the best defensive player on either top four pairing going forward, and that seriously limits our player acquisition options if Zach's a TM ride or die. Basically, keeping Bogo in the fold means no high-risk one-way players (with superior aggregate impacts on stuff we suck at) like Yandle or Shattenkirk, and no superior defensive RHDs like Demers. The opportunity cost of his roster + contract spot is one of the highest on the team.
And to unpack, I don't like his decisions in coverage or transition, don't like his willingness to engage regardless of the situation, don't like how he'll play the same style in the face of physical maladies limiting his effectiveness, and I don't like his ability to cover for a partner with defensive issues of his own.