I love uniformity. Quantity doesn't need to be massive. I value quality games over sheer volume. But the pick of jelly is when it's pick any game and within the pick button or two pressed you can play the game on a big TV.
Though on day I will make my self and arcade machine. I freaking love those things. I honestly think my first project will be a bar top arcade machine that I'll donate to my local American Legion that I'm a member of. As a kid growing up they had pho arcade machines that there actually video poker/slot machines. I'm SURE they won't mind unlicensed usage of games. At least the Cops won't mind unlike the slot machines.
But I'm big on cleanliness, organization, quality of games, and ease to play them. Think nice home theater but with video games instead of movies.