Rez rarely seems to change the game's outcome, as it just prolongs the hell out of it.
So like, that's the key thing. Rez does come out, but when it does it's usually not a big impactful thing. It's usually just a way to extend out bad fights. That's not a good ultimate really, you don't get a lot of the same benefits you get out of other ults. Sound Barrier or Trance are almost always better, and Nano is just in a different category really.
When Pharmercy is out, Rez fights are going to happen. Like, you run Mercy for the Pharah and there's no point in not using Rez. That doesn't mean the ult isn't still meh, that just means people are using what comes attached to the hero when they pick her. The most common way Rez is even used with Pharmercy in pro games is to solo Rez Pharah when she makes an oops because Mercy is borderline useless without her.
The shit that happens in Wraxu is just, well, it's just a symptom of what's going on in solo queue right now. Game quality is at an all time low and the rank system is fucked in a way where there's Mercy in every single game. In Mercy Mirrors, Rez is a lot better too. There aren't enough big team fight support ults in the game to really punish Rez like that :T
Idk. I know it's a meh tier ult, top players say it, the character isn't ran for the ult ever, it rarely is a truly impactful ult when it comes down in those matches. That just makes this "Mercy in every soloq game ever" problem even dumber to me. The fact the ranking system has let that happen is a next level type of joke to me. I'm telling you, you don't see Mercy in all these games because she's good with a lot of amazing OTPs getting clutch Rez. She's mediocre, but you can trust in dynamic queue to help make up for the fact somebody in a stack is picking her every single game.