The most recent example I can think of is Dead Space. It started of great, but someone turned into an action game during the middle. The few scares it had were gone, and it turned into a "find this, kill everything, find something else" type of game. That's actually what the entirety of the game is to me, but it was more interesting in the beginning. So now that I stopped whining, what game started off great for you, but got worse?