I think that gaming is going downhill somewhat, but mostly because of the excess of sequels or spin offs. Take Call of Duty for example, repeating the same stuff over and over gets old, and Modern Warfare brought a fresh idea to the series (probably why it sold so well). It's just that when developers come up with a good idea, they never use it in moderation. They have to beat every new idea into the ground, instead of creating a fresher idea.