Well, what can i say if not that i mostly agree with you ?
Leon and Helena ( i played as Helena ) are the most oldschool-like RE campaign.
1- The infected cityes, that somehow reminds you of RE2
2- Alone in a city full of zombies, plus the zombies that keep spawning make you always on edge
3- Dark places , full of atmosphere.
4- Places that reminds you of old school RE games : train --> RE0 ; sewer, city street --> RE2, RE3 , ...
5- Deborah, i find her design somehow similar to the first transformation of Alexia. Again reminders to old school RE games.
6 - Dogs, don't forget the dogs! --> RE 1 , 2 , 3.
7- Like old RE games, a lot of zombies, only few BOWs. Only 2 Lepotitsa and 1 giant fish
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That said, Helena campaign is my favourite. I love the story, atmosphere and the places.
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Piers campaign : i give the story a good 9 / 10 because Piers is a very well done character. And the story is nice.
Gameplay : 5 / 10. I am playing a RE game or a bad copy of DOOM 3 ?
DOOM 3 is :
1- Fps
2- enemyes are humans ( dead) that shoot at you
3- enemyes are demons of different kind
RE 6 Piers campaign is :
1- Fps
2- enemyes are humans ( mutated) that shoot at you
3- enemyes are BOWs of different kind
See the similarity ?
If i want to play a war game, i go play Wolfenstein...
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Jake campaign is like Piers, only boring.
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Ada is the only campaign that i have dropped after 1 hour of play.
Can't stand it, the gameplay is a bad copy of Metal Gear solid. And if i want to play a spy stealth game, i play Metal Gear Solid 1 - 3 and not RE6.
Ada campaign earned a 0 / 10 for me.