All in all, I think this thread is overblown. The value isn't that far off if you consider that Habs would likely make the playoffs, making the pick at least a 15th overall to 30th overall.
It's definitely not a quality for quantity, you get a premium defenseman prospect in Sergachev and an insurance with most likely a late 1st for a developping young established defenseman. People shouldn't be at each other's throats about it, but anyways.
I'm sure Jets fans would rather try signing Trouba and keep developping him. I like his game even though I haven't watched him all that much so I can't evaluate as good as you all do.
Still, not taking anything from Trouba at all, I would go with Sergachev as a Habs fan. Not claiming that he's going to be better or less paid or anything like that. But Sergachev is a LD and Trouba is a RD. At the moment, we have Weber, Petry and Pateryn on the right side. Taken Petry could be bumped down on the third pairing, or Trouba for that matter, I still think we are solid enough on the right side. In comparison, we are looking at Markov, Emelin and Beaulieu on the left side (unless Sergachev somehow impresses beyond expectations at training camp). Our left is rather weak at the moment. Markov is slowing down, Emelin is okay and Beaulieu has great upside, but hasn't yet been showing he's top pairing ready.
And you can add to that as well the cap reasons, we definitely don't have the space for Trouba unless a cap dump was added to the deal. And I doubt the Jets want anything to do with the likes of Desharnais, Emelin, Matteau or Flynn...