First Person Shooters.
While I give special privileges to those who know how to do it, there are TOO MANY OF THEM.
I'd prefer a game with different controls or goals than to "Shoot endless baddies through a first person perspective". Sometimes they're good, others, they are repetitive and have no reason to exist.
First person itself can be a brilliant perspective in gaming, as it offers unparalleled immersion and precision, but I'd love to see it used in different ways, much as Mirror's Edge was attempting to do. I'd love to see a new way for it to work, mysteries, stealth, punching stuff, etc.
Also on my list is Dialogue that freezes all time and space whilst you talk to some random dude. What if it was real time, and manipulated with, lets say, the same way you might scroll through an inventory, with the options displayed on a side, so you can point and shoot dialogue options at the npcs?