Mass Effect 3.
Mass Effect is my favourite game series, and one of my favourite series across all entertainment. And the fact that this was a trilogy, so it was a conclusion for the story and characters of the first 2 games made it even more exciting than just a disconnected sequel. I'm not going to go in depth on the ending because I think we've talked about that enough. I'll just say that I loved the first 26 hours and was disappointed by the last 15 minutes.
I think it did make me realise that getting THAT hyped up about a game is not healthy. It was almost impossible for Bioware to live up to my level of hype, the stories I'd constructed in my head, the gameplay features that I would have liked to see, consequences of decisions from past games, etc. Its actually quite amazing that I was able to enjoy it as much as I did.
These days, I don't allow myself to get that hyped up about any game. Witcher 3 is a perfect example because its a similar situation. I really enjoyed the first 2, I've actually recently replayed them - 1 is showing its age now but 2 is still an amazing game. And (I'm guessing) 3 will directly follow on from the cliffhangers and the end of 2. I want to see how the story ends. I'm definately going to play it. But I'm not like OMG OMG OMG SUPER HYPED.
I'm much more cynical about the games industry now. I've played enough disappointments, watched enough videos of broken messes - AAA and indie - that my default thought now is "what is wrong with this game?". I don't watch trailers, I don't read previews or interviews, I don't take part in the pre release marketing hype. I wait until a game is released, read the reviews, forum comments, decide if the game sounds good, wait for major bugs to get patched, and then maybe 1-2 months later, I'll play the game.