Honestly, Hale isn't supposed to be easy to kill, the bosses don't need nerfing, all you need to do is actually work as a team instead of running around as barrels hiding in corners.
1. In terms of Blitzkrieg, it would be nice to have his old theme back but he needs no further changes.
2. Knuckles, Miku, Shadow & Herobrine are not actually overpowered, they just use class specific perks to assist them.
3. Mann co. HQ is actually a half decent map, so why remove it?
4. MLG Sniper is supposed to be loud, have you never watched MLG remixes on YouTube?
5. Major Crits was incredibly oversized and glitched in maps, which is why it was removed.
Also, you should probably attach links to the bosses you want to be added, it'd increase your chances of getting it into the game. (Implying people do want them in the game that is, and if that boss doesn't exist then sorry, you won't get it added.)
wtf is with these kids and undertale?