Screamo is not very high on the commercial listeners list, but you do get communities out there that follow Screamo style music religiously. I am not completely a big fan of it myself but have gone down a road where i started listening to certain melodic screamo bands such as KSE (Kill Switch Engage) that hooked me to their style. I learned that screamo isn't just someone thats trying to scream angry etc etc... allthough you do get the odd ones out, but screamo is an art. If you are a vocalist, and you try to do screamo for the 1st time you will find it alot harder than you thought. There are professional DVD's of instructors that can help you to master the art without having to remove your vocal chords 6 months later.
In my time of listening to KSE, i have learned to respect the style, even though I'm not completely fond of it. It's the same principal as rock vs jazz, i love rock, but not a big fan of jazz, but as being a musician myself I know that a jazz musician is extremely good in what he does, so I respect them completely and praise them for they do.
But yeh, that's just my opinion. :)