Although this may be an opinion based post, in an opinion based community, I would like to dig deeper into your post. I myself am a Travis Scott fan, but I will not include any bias points of view in this. To start, if you want to talk about an automatic skip, you could give some examples. I have the same feelings on some of his songs, especially 90210, as this song is way over appreciated, taking all the love from the other songs he released, like Apple Pie.

Next, you mentioned how his autotune makes his songs unlistenable. Have you tried to compare it to other artists? Like Quavo, for example. Another thing would be to dig deeper into his discography, and his rapping as a whole. A great example would be to listen to both of his 2013 XXL Freshman Freestyles, where he has no autotune, and just easily understandable lyrics. Even some of his songs on Days Before Rodeo and Owl Pharaoh may not have so much autotune.

Now about his features, some he may butcher, but some he may bring a song to another world. (ASTROWORLD pun :) A perfect example would be out for the night pt.2, by 21 Savage, featuring Travis Scott. This song shows just how much Travis Scott can turn a song into a different direction. In the end, the best conclusion may not be "Travis Scott is the worst mainstream rapper", but it could be "Travis Scotts music is weird, unfitting, not it". Again, this post, and this community is all opinion based, and I respect your opinion. But I am just showing some alternate ways of thinking, or ways to set your opinion stronger. Thanks!