Lol at the amount of people saying the Didact. The fight with him was very underwhelming, yes, but that does not make him a bad villain. Not even close. I'm pretty sure 343 set him up to be defeated that way in order for him to survive for the following Halo 5 and 6. If you had riddled him with bullets to no end, everyone would call bullshit on him surviving into the later games. He's not dead and people need to accept that.