Screamers can be annoying in bed. They make so much noise and sometimes you just don't want other people all up in your business. I've also noticed that screamers tend to also be biters and nail diggers so if you're in so cal and go to the beach three times a week you may not want to get proof of your indecency. What about the advantages though?
The most obvious first. A girl who's screaming is a huge boon to the old sense of confidence that you're awesome in bed. with some girls only offering slight moans no matter how wet they are, the screamer makes a man feel like a man.
The worst thing in sex is to think about things while you're having sex (even that you're having sex!) Great sex is no thought at all--only doing. When someones screaming in your ear it's hard to hear your own thoughts
It's a catch 22. If a girl tells you that you're not hitting her spot you lose confidence and then perform even worse, but if she says nothing she leaves feeling she should've gotten a bit more pleasure. With a screamer you can tell if you're hitting the spot because not hitting it produces a small moan while hitting it right produces a scream. You can also tell how many orgasms she can handle and when its become so long that she's not really feeling the sensation as much by the fact that her screams become progressively further apart