I love it, and hate it.
343 did a great job, but, however, I don't like the new grunts and lack of the Arbiter.
I have only seen the Heroic ending, so I don't know if Legendary is different and 343, you ruined my birthday - I wont say why but those who have finished will probably guess why.
Now, this feels like Halo, but a bit easier although still very much Halo. One thing I am truly glad 343 kept is the ability to see your legs when you look down, I know most probably don't care, but MC still has legs
When I played it another few times and taken time to explore I shall write something proper