I beat the Leon portion of the game last night. Some thoughts on the end game:
Although I've really enjoyed this game a lot, if I'm going to be a bit critical, once you leave the police station the quality of the level design does go down quite a bit. It's far more linear, and far less scary overall. The plant monsters were so frikin lame (not scary/challenging), and the levels overall don't add any new interesting mechanics. Not sure why this would be, except maybe they spent a ton of time polishing that first chunk up and the rest didn't get as much attention. Whatever the case may be, pretty much from the moment I got into the sewers the game felt like it was already in its denouement phase, it would have been nice to return to the police station one more time for closure. The sewers weren't terrible, but then the Umbrella corps got even a bit worse, so the overall emotion was downhill. The Umbrella corp headquarters certainly attempted to give a sense of "scale", but I don't think it was successful at all in doing that, it felt tiny and cramped and rushed.
The last half of the game, for me, gets a 4-5/10 compared to the first half 10/10. It just felt really rushed.
The highlight of this game for me was definitely the end portion of the police station level, where Mr. X is chasing you around. That was some of the best horror gameplay I've ever experienced.