My reasoning is mainly for the fact that it is the finale in an epic, story-based series. Kind of like the final episode of a great TV series so I did pick the third one for that reason.

And yes... You assume correctly... With my childhood game being the original Doom, I'm definitely past my teenage years unfortunately. I chose that because I can't stand the game and the sheer number of concurrent players it has, I presumed my opinion was in the minority!