From Dragon Dog Press’ Glossary of Writing Terms

Slushpile – What the editors call the overwhelming amount of unagented and unsolicited material they receive. Most no longer look for gems among the slush (they rely on agents to do that job now). It’s very difficult for a new/unknown writer to find their way out of the slushpile and onto a desk.

Does slushpile have negative connotations? Or is it just this definition of the word that suggests that it’s overwhelming and not worth going through?