I don't think there is any issue with offsides, the rule or the challenge process. The technology is there to get it right and the challenges effect only a few games each playoffs. It's actually a very good process IMO.
Agreed on the ******** of the NHL though. There are very legit issues with obstruction, violent stick work, etc yet the league wants to focus on the one goal called back on an actual offsides play.
I forget which night of hockey it was but on HNIC Kypeos mentioned that the amount of slashing that goes on, in the regular season and the playoffs, is something that is going to be looked at this off season.