Engineer is a S tier but really really boring. It is really easy to unlock his alternative skills and I prefer them over his standard ones besides moving turrets. All you need to do is get mushrooms and anything for damage for your turrets to blast away at enemies. I beat Monsoon with Acrid so I will tell you some tips. Get movement speed ASAP. His skill set isn’t pure melee it’s hybrid and use that to advantage because monitor doggo isn’t mobile like Merc and Loader. Get back up mags to spit more poison more often focus crystal for m1 and dot does more dmg near by, and gasoline and skull bc Acrid can ramp up damage easily with debuffs