- No survival horror aspect. There wasn't a single point in the game where I was thinking "Should I run around this guy to preserve ammo?"
- No overly deadly monsters (Although, this one I may just be forgetting since it's been so long since I've done a playthrough of RE4), like Lickers or Hunters; I long for the days where you were so easily one shotted and yelled profanities through the air.
- No true files. Most of the story was explained to you throughout the gameplay, and reading the files had nothing to do with it. I like how in the original REs you'd have to read every file you found and piece together the story yourself (Like, I may be wrong, but after playing through RE2 again and reading everything in RE:UC I've come to the conclusion that Chief Irons created S.T.A.R.S. based on bribes by Umbrella, and S.T.A.R.S.' sole purpose for creation was to grant Umbrella with sufficient battle data when the time came for them to release their virus.).
- Also, speaking of the documents, they were all horribly done. How is it that you kill a boss, and in the next room someone left a document saying "This American killed <whatever>, he is strong!".
- Why the hell did they even need the President's daughter anyway? I guess maybe I missed that part of the plot because I stopped reading the documents after the first half of the game, but was she something like Lisa Trevor, perhaps?
- RE4 Leon is, in my opinion, a horrible character. And that's saying a lot, since RE2 Leon is my favorite character in the series. Before RE4 came out I was happy to see Leon being used again, but in such a way?
- There is ZERO scientific backing behind Los Plagas. I mean, the T Virus was worked on for what, tweny-plus years? And the G-Virus, T's successor, was Birkin's life work. Everything for the viruses was explained (Progenitor, the leeches, testing on animals, then using Umbrella employees, etc), but Los Plagas just comes out of left field as an "ancient virus" that somehow works alongside the T Virus to turn it's host into a controlled zombie. I mean, if there were any backing to this I'd really LOVE the story, but there is just no backing; It seems like Umbrella took the easy way out to avoid writing more story.
...You don't seem to have payed much attention to the story, which is apparently one of the things you're complaining about. First, Las Plagas creates drones, they aren't intelligent Zombies, they're people with Parasites in their head, T-Virus had nothing to do with anything in RE4.
Second, I'm not sure why you don't like RE4 Leon, you didn't really discuss that.
Third, it does have Survival horror, you just didn't see it because you're very good at survival horror. I hadn't pkayed any RE before RE4, and I was panicking at several moments, and holding active discussions in my head on what gun to use and how much ammo from it, and whether I needed a bigger clip, etc.
Fourth, The game contains 3 types of enemies capable of killing you instantly at the right range, not counting every iteration of the Chainsaw-guys, of which there are many, and there are countless other enemies that do obscene amounts of damage, it requires a great deal of tactical thought.
Fifth, yeah, no-one likes Ashley, she was shit. the plan was for her to be a drone, and to mutate at some appropriate moment, kill her dad, and then Saddler announces that he's taking shit over, that's that portion of the story, and it's pretty lame, I'll give you that.
Sixth,This is running long into a discussion of an entirely different topic, should we make another?
Seventh, had you read the files, you would have read Luis Sera's extensive research on the Las Plagas and it's workings, summing up his 10 or so years of research on the matter.
Honestly, the most interesting parts of the story were contained within Ada's subgame, Seperate ways, and I wouldn't be surprised that you hadn't played through that. I heartily recommend it however, as there is far more of a survival component, and her briefings contain a great amount of plot. Including info on Luis, Krauser, and Ada's dealings with Wesker.
The Plagas is Wesker's Back-up plan, That's as close as I can get to it's connection to the main story, although it goes deeper than that.
EDIT: Also, I believe Russia is After, although I'm not sure.