something that solving a complex problem, something innovative and "has not been done before"
I remember when the engineers working on Assassin Creed III were tackling "slopes"(climbing problem) which combines animation and engineering.
I also remember a documentary about how the team working on God of War I were doing some really technically heavy things on all fronts: I remember it took the team a week to get a monster in the game.
Source: http://www.vg247.com/2012/06/07/assassins-creed-is-about-climbing-not-buildings/
I do understand that game is a business and there are deadlines and there is never enough time to work on the game no matter how big the team is.
I have seen Ubisoft being more considerate about the polish of their recent game "Watch Dogs".
So does it depend on the publisher since they are the ones financing the project or does it depend on the project(scope and money invested into it) ?