What do you mean camo is useless? It's way more useful than in the third game. Plus you can sneak around if you want, MGS has always been about choosing between sneaking or just shooting everyone. And there's a map that tells you where to go.

But if you don't like it then there's nothing to be done about that. But I can assure you that the ending sucks balls (unless you like the cornyness of Harry Potter) and it's a pain in the ass to watch over 9 hours of cutscenes.