Did they really ban people who used the missile glitch in ME3? That's stupid. I didn't use that glitch, but it's a glitch, not a hack. Why would someone be help responsible for something the devs should simply patch out? Seriously, I hated it when people used that glitch, but no one should be banned for it.
The devs tried to patch it out like a half dozen times. No joke. Nothing simple about it. Remember when the Acolyte was randomly weaker but no longer charge-to-fire? Yeah, that was one attempt. Didn't work.
Exploiting a bug is the same as hacking to me, at least in the mentality of it. Why? Because hacking involves exploiting weaknesses or bugs as a key component of the process.
It was absolutely game-breaking watching an N7 Destroyer stand there and spam missiles while everyone else could literally do nothing.
I, for one, completely support banning people exploiting a game-breaking bug like that. The whole "PvE Co-Op" or "Developers Fault" justifications just not cut it in my eyes.
Obviously that's just my highly biased opinion, and should not be considered even remotely an authoritative or credible argument on the subject.