My laptop is a Dell XPS of about the same vintage. Maybe 2011. Always has had terrible battery life. An Apple laptop is the final piece of the puzzle needed to complete my transition to using Apple products across the board. The transition began in April of 2014 and started with an iPad.
Not these days. I've considered installing a game just to see how it handles it, but I really don't even have anything that would test its capabilities. Despite the few complaints I've heard about throttling, I feel like the reviews for its gaming performance were pretty positive.