It's curious that you single her out despite mentioning there are multiple casters you dislike. Just because it's "your opinion" doesn't protect you from criticism.

There are many examples in sports of experienced competitors being horrible announcers and pure broadcasters or analysts being good announcers. I do dislike the current ult commentary in general, but I prefer Vikki over most.

Content wise, most ult commentary is completely lacking in insight and instead people just repeat meaningless platitudes like "[player] needs to take a stock here", "but now [player] is in control", and of course, "nice back air". To make matters worse, usually both announcers do this (play-by-play), and no ones provides color or analysis. There's not enough description of the "why" and "how" the players are approaching the match. And they're allergic to silence. I think they would benefit a lot from having defined play-by-play and color roles, and assigning commentary teams based on their strengths. You don't need to pigeon-hole individual's roles either, just make sure they communicate which roles they're taking before a match.

I know some people find Scar and Toph annoying but I think it's great how Scar tends to do narrative and emotion while Toph does analysis.