The thing about it is, if they can get the correct decisions and do it swiftly, then it's for the best.
But much of the time - in the Premier League - they can't even fulfil the above conditions. The amount of times they have taken ages over something that is absolutely clear on replays to us viewers, for example. Probably looking for something else to disallow a goal.
I don't think the technology is it fault - it's the incompetence and arguably bias of those implementing the technology. Personally I wouldn't blame VAR so much as I would say that the officials need to get better at using it. But maybe that is harsh as they have a very hard and thankless job as it is.
I would also suggest that something must be done about the offside rule - toes and toenails are ridiculous. Maybe there should be a degree of daylight - but how do you decide is too much and too little? It does seem awful that great goals are being ruled out for being 'offside' when very little if any advantage was received from it.
By far the biggest drawback of VAR though - for the fans - is the letdown of celebrating a goal and having it taken away.
Ultimately, I would say that football is such a complex game sometimes, with 22 players on the park, 20 generally running and buzzing around, and there's so much that can happen off the ball, on the ball, so much that can be seen to be wrong and for a goal to be ruled out. With a game with so much activity there's plenty that an official can get wrong (or if you wanna be conspiratorial, will want to use to rule out goals for certain sides).
I am still not sure if I am in favour of it or not. In the PL at least, in its current guise, it isn't working. But if people can learn how to use it better, it could be much improved. Bear in mind it's still a relatively new technology as it was first trialed in men's senior football in 2016, I believe.
Video technology works well in other sports e.g. rugby, field hockey, so perhaps football can learn something from those sports.
That's just what I think though and others might disagree.