It's taking me quite a bit of time to adjust to the new aiming system (I'm getting old). Overall, I'm not going to say it is bad, just very different. Regardless, I'm surprised they are managing this "out in the tails" as I like to refer to this sort of thing (i.e., catoring to the 0.05% of the population). In a mass market game designed to appeal to a broad spectrum, it's confusing to cator something so fundamental as aiming mechanics to "pros". If the rest of the population doesn't catch on, the overall online user base is going to shrink drastically out of frustration. Seems like a poor design choice to me. If you want to cator to the pro segment, do so with specific playlists as opposed to the entire game.
I love halo and, as such, I'm working on this and giving it a chance. However, I'd be lying if I said I didn't think it was a poor design choice.