[kupoartist]

to the individual its almost certain, but there are certain questions that arise from this: is the development time of an action game getting longer, therefore leaving them "cut short" and more importantly, is the skill of the people playing the games the main reason for why we find them getting shorter:

action games are undeniably similar (at least in sub genres like 3rd and 1st person perspective games), so it stands to reason that you can become skilled at playing that type of game. Naturally, a newer game will last for a lesser ammount of time when you're immediatly prepared for the way it plays.