I do have some badly warped styrene, but I agree it's rarer than vinyl. I also know that unplayed styrene can sound great.
The more specific problem I have with the distortion is that it's a specific type of distortion that sounds much worse than, say, a trashed vinyl record. The high end distortion just sounds so bad. You can tune out constant white noise or even crackle but every time the styrene distortion hits it's painful.
The other thing that's bad about distorted styrene is that there's often no visual evidence of it. A good looking vinyl record will generally play well (at least after cleaning it, obviously with some rare exceptions). A perfectly looking styrene record can be burnt and distorted and there's just no way to tell until after you get it and play it and hear the painful distortion.
I agree about styrene being easier to crack. But one thing that really pisses me off are the stress lines that I guess are not cracks on styrene records. Someone here once said that they are a product of the cooling process or something. I hate cracks and those stress lines are like something in the middle between cracked and uncracked. It's some weird record collector OCD thing, but I hate those. I even used to send records back when they had those but I gave up because they're so common.