There's two main reasons I think offside reviews are stupid and bad for the game.
1) the vast, vast majority of the disallowed goals are not really being disallowed in the spirit of the rule. the reality is marginal offsides happen all the god damn time and it doesn't have any impact on the game. the reason the rule exists is to prevent players from lurking in the offensive zone waiting for a stretch pass.
2) offside challenges, unlike interference challenges, can only be used to call off a goal that was scored. what about all the times a ref calls an offside that was actually on-side? play is dead before it happens.