There's a difference between acting like RE was something deep and complex, and thinking that RE4 was a great game that combined action and horror and that RE5 went too far into the action category (and was a mediocre game overall), and that the trailer seems to show that same unfavorable trend continuing.
Honestly RE5 was just disappointing for me since it felt like a rehash of RE4 and had an emphasis on a gameplay mechanic (co-op) which is naturally going to make any horror-elements of the game less horrific when you have a buddy to play with.
This game still seems to be focusing on the action-side of things, but honestly this trailer seems to be an indication its moving away from what RE5 did wrong. You have the return of zombies and other mutant enemies instead of RE4 and 5's humanoid ganandos (besides the soldiers/terrorists you can see Chris' group fighting). Even more importantly the settings we've seen seem to lend themselves much more to that dreary, unsettling and claustrophobic feeling the older RE games achieved as opposed to RE4 and especially 5's wide-open, sunny, almost 'arena'-like locations. Even the city and Russia areas seem more confined and restrictive due to piled up cars, fires ablaze everywhere and it being pitch-black night-time (besides the Russian town, and that still very much embodies 'dreary').
Out of all the dumb shit RE5 pulled removing the emphasis on puzzles was one of the more forward-thinking things. There are better ways to encourage exploration in a horror game than 'find X on opposite side of the map, find where to put X in Y hole, gain access to new area/weapon/item to put into another hole'.
I know being open-arms about this is almost as foolish as instantly damning it and I'm not a fan of RE5 either, but I honestly felt this trailer gave me more hope for RE6 than anxiety. The talk about the lack of puzzles is particularly dumb; it felt like padding in the earlier games and in RE4 it felt like it was there for the sake of there being puzzles in a RE game.
