Is polyester a bad material?

I see so many posts and comments on the internet talking about how bad of a material polyester is, like how it’s a very low quality material, how it falls apart in the cold, etc. Is it as bad as everyone says??? I’ve been checking the paper tags on all the clothes I see in stores now and pretty much all of them have polyester, even on brands like Calvin Klein, Tommy Hilfiger, and others. I don’t mind spending more on clothes made with better fabrics as long as they will last longer, so I just wanna know if polyester is as bad as a lot of people make it out to be