Can't explain this but whenever I got back to the first Titanfall after months playing the second iteration in the game series, I play like I'm on speed and manage to get kills even when I would usually get killed instead.
Maybe it's because you have to control a lot less in Titanfall 1: movement is much simpler as there's no slide and, even though I still can't bunny hop, I frantically jump all over the place.
It's a satisfying feeling being the MVP in a game you haven't touched for months! :)