Nothing is "scripted" in AGU. You can fuck up royally in that mission and it can be unforgiving if you don't pay attention.
A stealth mission like AGU would be something I would replay in Halo 5.
Of course it is scripted. In fact, most of the level is so ridiculously scripted than if you deviate even a little from what you are supposed to do then it is an instant Game Over. I don't want that kind of awful game design in Halo.
Levels like The Ark, The Covenant, etc. allow for many different approaches, and are very replayable. That's the kind of level design I want in Halo, not something like that All Ghillied Up where it plays exactly the same every time.
It makes sense that revealing your position to a helicopter or field of troops or tanks that can mow you down in seconds kills you. That's not bad design, it's the basis of the design for the level. You are outgunned and you better not fuck it up.
It's a stealth mission where the objective is to not give away your position to an entire army. That's not awful design.
Yes it is. When a game limits your actions to such a ridiculous degree, then it stops being a game, and starts being a (slightly interactive) movie. And that's ok if you are playing a David Cage game, but it's definetly not ok in an FPS, especially not in Halo.
It's actually more open than your think. It's understandable people think it's one route scripted but you can play it different ways.
http://www.neogaf.com/forum/showthread.php?t=917734&highlight=all+ghillied+up
There's nothing open about it. Thanks for that link though, glad to see people in that thread critizicing that level for the same reasons I've mentioned. Thankfully, not everyone is so easily fooled by that "OMG WOW SO MUCH SPECTACLE" kind of approach of most modern shooters, and can actually recognize how awful and shallow levels like All Ghillied Up really are.
Again, Halo should never try to imitate that shit, and instead should keep giving us more amazing levels like Tsavo Highway, The Ark, The Covenant, etc. Man, Halo 3 had flaws, but damn if the Campaign wasn't an absolute masterpiece. Such an amazing example of great game design... Love it.