Bugs have terrible armor penetration, so some heavily armed melee pawns are basically invulnerable. Ghouls from anomaly, with some bionics, are also great.
You can also cheese their spawn location relatively easily, or prevent them from spawning entirely if the temp is below (iirc) -17 c.
There are really only 3 search providers, Google, Bing, and Yandex.
All others will pay one of these three to use their indexes, since creating and maintaining that index is incredibly expensive.