Great ending in my opinion, can understand not revealing the guy upstairs. But a few gripes...
1) There has to be another episode! Like an Aftermath Episode. What, afterwards they just go back to video games, knowing they're still killing NPC's in the gaming world?
and 2) Shanks found Polybius a little too easily. He was just... there.
Besides that, it was epic, everyone and everything went out with a bang. I just wish it wasn't as simple as pressing a button. Then again, I guess that's what gamers are good for.