Note: the friendly fire bug is only from weapons that emit an AOE. EG: Plasma gun and grenade launcher.

I can empty my minigun on any friendly and it doesn't damage them one bit.

Since most people go for high-mobility + running around, I've decided to go for a high damage low movement build:

Mini gun + grenade launcher + justice.

The combination of these 3 just makes it impossible for things to get near you and your team mates.

EUW here too.