Oilers fan here. You guys absolutely fleeced Chiarelli on this one. Marincin was Edmonton's best d-man after Petry left.
He struggled this year at times...but it's because the Oilers organization was absolutely stupid with his development (and it still is below Chiarelli, honestly speaking. His left and right hand men now are the idiots that idioted the Oilers into Idiotville in the first place). They told him to put on 20 pounds over 4.5 months. And then they were confused as to why he wasn't as agile and mobile as he was the previous year. So they sent him down to the AHL. When Nelson got promoted, Marincin stuck around til the end and steadily improved all season. By the time Petry was traded, he was Edmonton's second best d-man and even though Klefbom has better puck moving ability, I'd still say Marincin was *net overall* Edmonton's best d-man between Petry leaving and the end of the year. He faced tougher opposition, tougher zone starts, and generally had as good or slightly worse possession stats as Klefbom. Fayne's inability to move the puck really limited him on a team with few people able to move the puck (in case anybody was wondering about where he fit in).
They've now traded their two best d-men on the worst d-corps in the league for...Eric Gryba, Griffin Reinhart, and nothing else that matters.
You guys should be thanking your lucky stars. Marincin will play 500+ games in the league, many of them as a top-4 d-man who plays tough minutes, tough zone starts, and moves the puck out of his own end efficiently. And all you gave up was a 4th rounder and an ECHLer whose fists are bigger than his head. Well done, as much as I hate saying that to Leafs fans.
He still has head scratching games and strings of games, but his English is still developing. He's really only starting to be able to take basic questions from the media now, and once that picks up, he should be more consistent-- that's what it looks like to me, anyway.