Just because you are excited doesn't mean others have to be, gambit is the second least popular gametype in the game, so it makes perfect sense that many would not care to have an entire DLC dedicated to it. You are free to like and go play gambit and they are free to dislike and complain about gambit. This DLC only has a little bit of something for a very a portion of the player base, so while you may like it, there are going to be a large number of people that don't.