VAR: can it be improved? Watch
Back to the original topic, I don't think there's anything wrong with VAR, I think there's an issue with the actual rules, the lack of consistency and the incompetent referees that we have in England. Michael Oliver is the only credible one out there, the rest are woeful.
Calling offside for your armpit being offside? That's barbaric. God knows how the referee didn't give Arsenal a penalty a few days ago for clamping Pepe, I think that's a stonewall penalty. De Gea last night? I don't think De Gea was strong enough and the goal should have simply stood. What about Rashford's goal at Old Trafford against Liverpool? Origi was clearly fouled in the buildup, but VAR decided it wasn't a foul for one reason or another.
Personally believe that the rules need to be slightly changed and the referee should be able to visit the VAR screen himself on the touchline.
In terms of time taken, I think there are two options:
1) Each time has a maximum of reviews (e.g. 3) and only if they ask for a review is is made. Then you know the maximum number of stoppages otherwise the ref is in charge.
2) VAR looks at everything like now but if it takes them longer than a set time (e.g. 30 or 60 seconds) and if they don't have a decision then it's not clear and obvious and the benefit stays with the ref. Although in this scenario, I'm not sure how long it takes them to pull up the video replays.