I'm in the minority since I started playing with the original Fallout (1). To me, it's the best RPG ever made. Your choices have weight, it has tons and tons of quests and adventures on its world (which isn't huge by today's standards but still feels large enough). The story is excellent, the ending is perhaps the most memorable ending to a video game I've ever experienced aside from MGS1 and FFVII. Oh also, the gameplay is freaking great.
If you read this and haven't played it just cause it's old or because it isn't an FPS, please give it a chance. It's Magnificent with a capital M!