I am not trying to judge. Critics sometimes look harsh but i am doing it (or did) it many times. No matter if it was my clan, myself, replay commentary etc.
Thing is i am trying to get a picture of certain situations and looking what would have been possible. which unit fielded etc etc. From players and sides in total. That way i think its easier and better to find real balance issues and less blaming player mistakes as balance issue.
Sometimes, when a certain unit or whatever turned out to be the key to victory i will watch the replay again, see when it comes and then pausing. See what players have on units and ressources, which res are not used (or could have been to get this or that or to OP points to be able to get this particular unit earlier etc).
Sometimes its worth watching a game many times. And sometimes you might see something where you say at the end: "to counter this in particular the ammount of perfect playing up to this time had to be perfect in order to have such an advantaged position already that this unit can be countered".
If you do that with many games you can get a more sensible feeling over the "total". There will never be something like a 100% truth. But sometimes i would wish more players would do some sort of precious work of analyzing several games from minute to minute.
Or how frequently a certain unit behaves exceptionally good or turning games. Or which units rarely show any impact, no matter who uses them.