Resigning in this case is like borderline admitting you couldn't do the job in an unbiased way. (Either that or couldn't handle the pressure)
Either way I blame the NHL more than I do him. It's hard to be unbias and for a guy whose kid plays for an NHL team... the NHL really should have been smarter than this and on top of that should have made it a committee in the first place.
Campbell definitely did a lot to diminish the NHL's reputation by constantly contradicting his VERY OWN established precedents and making inconsistent rulings, often directly contradicting things he can be demonstrated to have said without explanation or justification.
This is even beyond pretending that a major league like the NHL can credibly have their justice run by a guy whose child is active as a player within the league, or someone who reports to that same hockey dad.
Goodbye and good riddance. If your justice guy doesn't understand the principle of "conflict of interest", maybe it's time for them to hang up the gavel.