Spoiler end of the game questions.

Why did the Chief have to set off the nuke after they killed the didact?
Their was still enough of Cortana left to just shut down the beam, right she seemed to be able to save him from a NUKE!
Also quick time events are always the best way to make a boss battle right, am I right?
He could have just crawled over and pressed a button they seem to do every thing else in halo 4 why not (press to shut off big beam of death) button?!?

But all joking aside what did you think of the ending?

I thought it was silly, and I really hope Cortana is not dead, good writing would have found a way to save her and Halo 5, and 6 with no Cortana almost makes no sense at all.