VAR is definitely costing us.
Specifically, a goal disallowed for a "deliberate" use of the arm when it brushed Berge's arm while chesting it down, cost us 2 points at Forset. (Only two men in the world thought it was deliberate, and they were the ref and the VAR ref. The deflection was so tiny that it could only be seen because there was a perfectly positioned super-slowmo camera.)
An equalising goal disallowed against Bournemouth, after it took 5 and a half minutes drawing lines on the screen to be certain that they weren't level.
And a penalty denied against West Ham for an offence noticeably greater than Man United or Fulham had last weekend.
One thing VAR does is introduce a random element to the game. It's 11 v 11, there is already random elements like the bounce of the ball and the performance of the ref, and VAR now adds another random element because there is no way to guess what it will do.