I'm probably alone in this one, but I haven't seen anything special in RE4.
Since the topic is not about rant on RE4, my opinion is in white text below.
RE4:
-Lack of atmosphere, not a single scary moment.
-repetitive gameplay
-too predictable: Pick up the key-> swarm of enemies
-ridiculous voice packs for villagers/soldiers/cult members -some of them even laughable/funny, instead of being scary
The only redeeming quality of the game, is that its' graphics were the best around that time.
RE1, on the other hand, defined the survival horror genre, and become a trendsetter for its' and the following generations (eg: Silent Hill).