I love Seguin and the Bruins are my second favorite team, so I can say with full confidence that this was not even close to the worst trade since the lockout.
Seguin would never have flourished like this in Boston, and he was beginning to get too comfortable with the night life scene. He wasn't a cancer, and he likely never would have been, but he wasn't what they were looking for personality-wise for their franchise player.
Regardless of all that, though, Eriksson, Smith and Morrow are all good players in their own right, and although none will ever be as good as Seguin, it's a very respectable return.