I know that this has been discussed many times, but I want to give my perspective.
To my knowledge, the only advantage that a Scrapper has is critical hits. This makes it better at the beginning of a fight. It isn't long before a Brute's Fury increases the damage to exceed a crit.
When I start a new toon, I do the Matthew Habashy arc. Near the end is a room full of force doors. I usually destroy the doors because there is a badge for destroying 100 doors. For most toons, it takes around 12 hits to destroy a door, give or take a few. When playing my StJ/WP Brute, it took around 6 hits to destroy the door. There aren't many fights before that room, so I can only do so much to build up Fury.
Please feel free to agree or disagree with me.