Turbo Overkill Difficulty Inconsistency? – From /r/BoomerShooters

So far I’m loving Turbo Overkill but I feel like there’s an inconsistency with the difficulty. I’m currently playing my first run at Street Cleaner, 3rd stage of Episode 2.

I noticed the boss battles were way too easy compared to the normal arena battles. Or is Street Cleaner not really as difficult as UltraViolence in Doom Eternal? Or should I have started with Serve Me Pain instead?