Somewhat tough to listen to with Loubardias getting upset and interrupting Steinberg, then not understanding his point.
I think he can be a solid #4 if you've got a good #3 to play him with, but I agree that he's over his head as our #3 and he's overmatched against top competition. As far as shot-blocking, Russell blocks a higher percentage of shot attempts against than any other flame. IIRC last time I looked it up he blocked ~21% of attempts against while he's on the ice, while our other D were between 10% and 17%. It's not just him getting outshot, he is actually very good at blocking shots (as anyone who watches him can attest).
He's a very agile skater and is quite good carrying the puck up the ice, and I also agree that he's a hard worker and a great locker room guy. However his breakout passes aren't all that accurate and he's a really mediocre shooter, and his size really limits him in puck battles.
Honestly, I think his biggest problem is he relies too much on his shot-blocking. It leads to him backing off of incoming forwards way too much on the rush, which makes zone entries against him extremely easy, and I think that's the biggest explanation for his incredibly poor possession stats. I'm very curious to see how he performs with a coach who doesn't emphasize shot blocking as much - I could easily see him being a very solid second pairing guy with much better stats if he played more aggressively.