Let's get this out of the way first: of course this is sour grapes.
The Bruins had a goal taken off the board last night due to an offside challenge, and they ended up losing a one-goal game.
Oddly enough, both of their regulation losses this year have featured goals wiped out by a coach's challenge.
So yeah, of course there's a level of bitterness. However, there's no denying that not many hockey fans think the NHL's current process for reviewing offside calls is a good one.
The rule is pretty much universally panned, mainly because the league sought to address egregious missed calls and instead is using Super Troopers-esque ENHANCE, ENHANCE, ENHANCE digital forensics to take goals away.