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Entropy: Zero 2's rebel shotgunner and sniper they can one shot you on hardmode

Fast zombies and pit drones. they can 360 quickscope you from 4096 hammer units away

I hate the controllers. I wouldn’t get rid of them, but I still hate them.

Combine snipers

in black mesa i found the assassins (and sometimes the army grunts) fairly annoying because of how in half life 1 they were built around the engine limitations but in black mesa they can be really tough

hl1- assassin hl2-manhack or poison zombie

Manhacks

I hate The poison zombie