It has been a complete failure in my opinion. It's frustrating, because in Scotland we had ample opportunity to watch it fail in England (and elsewhere) first. It's such a huge change to the game that match-going fans weren't asked their opinion on too. Although I'm almost certain that enough people would have voted for it because of nebulous ideas such as "being left behind", "progress" and "refs in Europe". I don't even like it when we get a VAR decision in our favour, it just feels wrong most of the time. I think it's because they've made up new reasons for fouls (handball and having your cock offside) and then VAR gives us fouls for those new rules. Those are the majority of instances, with a handful - per season - of correcting poor ref calls added in.
Unfortunately it's not an experiment either, it's now fully embedded and can't be overturned (ironic, given its purpose). Like everything in our technologically religious world, the answer to shite tech is bureaucracy or more shite tech. Some clever fucker once said something about the most progressive way to progress being to go backward, or some shit. I'm guessing that they were referring to social media, or TV or whatever, but it's applicable here. We marched into a technology without questioning what it would do. We didn't say: "is the purpose of offside really to chalk off goals where a player is only a foot off?". We couldn't even come up with a definition of clear and obvious. The next step will be to amend the rules or make the technology faster, rather than to go back and ask why.