My opinion on VAR has flipped after seeing how it has been implemented. I think it has been a good thing and hopefully some elements of the game (shirt pulling in the box during set pieces especially) will start to be called more but that hasn't been the case since the Croatia/Nigeria game (iirc).
The main problem that will likely never be solved is that every ref will have a different view of the same incident. Also think that going to VAR so far is a guarantee for the decision to be changed (don't remember a call that stayed the same after a review).