Gamers both demand and deserve novelty. They need something new. As a game developer, one of my rules is there will be at least one thing in every game that I worked on that no one on the planet has seen before.
Seriously, I don't know if people would really tell you this. But in my dream world, the people who work for you would say, 'Wow, I didn't know I could do that until I started working with that guy.'
I remember on Deus Ex there was one programmer - Alex Durand, a guy who still works for us - he decided he was going to get through the game without ever using a weapon. I would never think to do that. And that's fine.