Most Sports
-Players being injured or just bad calls in general that lead to suspensions/sanctions after the fact that benefit every team that the offending team plays in the future but does absolutely nothing for the team that was infringed against.
In certain circumstances you'd be missing a player through injury, after a terrible tackle, for a few months so your team suffers but it's ok! The offending player got supsended.....which does what exactly for your team?
Rugby League
-Video technology leading to referees being too intimidated to make a call themselves even if it's an obvious one. So it's just endlessly sending it to the video ref often uncessarily.
-Golden point extra time, it's just a penalty goal attempt-fest.
-Back to the referees. The reluctance to send players off, even when they clearly deserve it for fear of being accused of 'ruining the game' by giving one team a player advantage.(kind of fits into the general complaint)