It was mind-blowing to see the game you grow up with also grew up with you. Despite the kinda lazy decision to re-use Reach assets and a few tweaks to the sound design, I cannot complain, the game is amazing as it was 10 years ago and I still love it. Also, as an avid achievement-getter, it was very interesting to see what kind of achievements they were going to implement and I was not disappointed in the slightest.