I am torn. On one hand, I think thrusters and more acrobatics are cool, and I dreamed about such features in Halo 3's heyday. However, the "ground pound" is just downright stupid. It's in NO WAY believable as a military tactic, and it blatantly breaks with physics just for "cool factor". It's cool if Thor or Iron Man does it, but it's an obvious "super hero pose", and should stay in the 14-year old's sketchbook it came from.
There's also the part about cluttering up the gameplay with just too many things to do. While I can get on board with some form of thrusters/jetpack, clambering, perhaps even sliding and bashing, the ground pound and air-hovering and ADS is just too much.
The brilliance of Halo's multiplayer has always been in it's simplicity and that every action and every weapon has served its specific role while always being accessible. If you haven't experienced that, then I feel sorry that you missed out on it.
And to be clear, I'm in no way a pro Halo player, I'm average at best, and play mainly for campaign. Halo's multiplayer just worked for me BECAUSE it was so simple to get into, yet opened up for creativity unlike most military shooters that are all about leveling and twitchy trigger fingers.