It probably gets 95% of the calls right. FIFA says 99.3% but I don’t think so. Still, if it didn’t exist everyone would be crying to implement technology like they did before. Think of all the goals/no goals that have been rightfully overturned. Even if there are some horrible calls sometimes, the good calls outweigh the bad ones.
I agree about people only getting upset when it’s against their club.
I don’t think the issue is with VAR. Some of the rules/laws need to be amended. Some of the laws create unfair outcomes. But in regard to VAR, I can’t imagine people upset by the fact that the right decisions are being made.