New to Necromunda, what are the blatant overpowered/do not spam things in this game?

I've only played a few skirmish games, but seems a lot of people I've played against always mention one or two items that are just not well balanced in necromunda, and that you can use them but not spam them out. I've mostly just heard about Web guns and ablative overlay, and overseer, but what other things just sorta are good to stay away from or limit?