3) Resident Evil 4

Players ones again jump into the shoes of Leon S. Kennedy. This time around, they're dropped in on a remote island tasked with finding the President's daughter. Leon is now a bit older, more grizzled, and a member of the CIA. Many see this as a turning point for the series, and it is, as it dropped the fixed-camera, 3rd person view for an over-the-shoulder view.

The familiar tank controls are in place, but now players have more control over aiming, and there's also a bit more movement involved compared to other Resident Evil entries. 

Resident Evil 4 is one of my all time favorites as it marries action to ambiance. The game still retains much of the horror aspect of previous titles, ammo is scarce, as are healing items. Leon is practically alone on an island of people that want him dead. The odds always feel against you, and that creates a sense of tension that Capcom has had trouble trying to recapture. Many would say that this is the Magnum Opus of the series.