What pisses me off of MGS V, despite the gameplay features inconsistencies (though this is a thing for the whole series, 3 has a cool healing feature, 4 has Octocamo, stress, etc. whereas 5 has none of that, and you could get badly hurt and press Y / Triangle to fix yourself up), is how great the first section is.
It's just a movie, not a lot of gameplay elements, but it's really well done. Then you go and save Kaz, and the gameplay loop begins and it gets stale after a few hours.
D-Dog with taser = OP