Bruins clearly didn't like the person that Seguin was developing into and decided to cut bait before it got any worse. The problem I see happening with this trade is Seguin will probably score about 35-40 goals next year for a Dallas team that doesn't make the playoffs and if the Bruins don't make it to the finals everyone will be like, "see.. Shouldn't have trade him," even though he did nothing for us in the playoffs last year.
Erikkson is a fantastic hockey player, and definitely fits the system more than Seguin in that he plays both ends of the ice really well. He scores about 30 goals a year, but he plays much more physical on the offensive end of the ice than Seguin will probably ever develop. Erikkson will be a better playoff performer because of it, with the physicality of play ramping up in the playoffs.
I like this trade a lot. One, because of the player we got back, and two, because we were able to shed Rich Peverly's salary as well meaning we can afford to fill Horton's spot with someone like maybe Iginla.