Resident Evil is just fantastic!
It's pretty methodological game, you have to be able to back track and even have a notebook to keep track of everything this game puts on your way. the world of RE is fairly small, you'll be confined to a mansion that has it's share of hidden locations, so it will keep it fresh even if you eventually come to the very first place you started the game. This game was very refreshing when it first came out and even today I had a lot of fun going through the campaign and remembering the rooms that I visited 15 years ago.
As of an original PS game, it might be hard for some people to get into the game since you're are a very blocky character, and the voice over is just outrageously cheesintastic, yeah, it deserves a new word to describe it. Do yourself a favor, track this game down if you haven't, it's where everything started.