I don't know if VAR is good or not since there are different iterations of it. None of them appear to be much good from what I've seen. They supposedly operate under the VAR intervening when a 'clear and obvious error' was made by an on-field referee.
In this country the system is used more like a Video Referee (with another referee essentially making the most important decisions instead of the on-field refs). It's hard to say whether this is better or not than other systems without hearing the conversations between on-field ref and VAR, so we don't know what questions the on-field ref is asking, the information they are sharing or what answers the video referee is providing. That's my biggest concern with it currently, there's no accountability and consistency for decisions.
When I watched the FIFA club cup they used VAR differently. They asked the referee to go and view a monitor and then decide if he wanted to change his original decision. There was no audible conversations again, so I don't know how the referee decided a 'clear and obvious' mistake, but what made this worse was the really poor quality of the pictures they gave to the referee on the monitor to make his decision on. They were really blurry.
The main reason I bought into VAR was because I thought we would see the end to teams harranging the referee to try and get opponents sent off or to influence big decisions in a game, but that appears to be the same. I hate seeing that. The players and managers know that doing this does influence the referee's decision making. It's slightly more protected in our system than the FIFA system (because someone external makes the decision), but we don't hear the conversations between them so don't know this for sure.
The VAR approach to offside is another story entirely and a major frustration of mine, but I can't be bothered typing any more.