I get all that. But the SMG is positioned as a tier 2 weapon instead of a loadout weapon. So to make obtaining it and using it of strategic importance, it has a higher rate of fire than previous iterations.
As far as not being able turn the camera, that harkens back to halo of old. It's not a new thing. The idea is that you need to communicate to figure out where enemies are located instead of the game giving you all the information. After the match, you can access the entire battle, from any angle in theater. You can't ask for better feedback than that. But to have the game essentially spell out enemy tactics in the middle of the match doesn't make you better, it handicaps you.
Halo 5 has a lot more systems at play than any other Halo, so the learning curve is steeper no doubt. I guess that's a turn off for some.