Never been a huge Halo fan, but I gotta say, this was my favourite in the series in terms of gameplay. Might be the gameplay, might be the grappling hook.
Grappling hooks make everything better, prove me wrong.
The story was ok, not as good as the legendary Halo 3 of course but bearable nonetheless.
I liked the "young" Cortana, she was the only interesting character in the story, alongside Master Chief.
Open world concept in very well executed, although I would have loved to have some variants in the biome.