This is a poor example. Of course you'll know when you mess up an intrinsic part of your rotation, especially if it results in a death.. What a parse does is show the numerical effect on smaller mistakes or what part of your rotation is worth sacrificing if a mechanic comes up. "Should I use Battle Litany here or time it with raid buffs?" "Will Chaos Thrust last or would double Full Thrust be better?"
And yes, it judges other players based on their numbers. I fail to see the negative when used properly. Per my example a few pages back, Mr. Rockbreaker Monk basically contributed 50% less than his role should, forcing the other players to pick up her slack. This inherently makes deaths potentially more difficult to recover. Why shouldn't players who are woefully underperforming be "called out"? It doesn't need to be aggressively, but I'm also not there to carry someone else who, frankly, isn't yet suited for Savage.