My first experience of the Fallout series was Fallout 3, so I wanted to go back and experience the first two games. These are very different games, in that they are isometric RPGs, and they're from the 1990's, so be prepared for things to be a little clunky compared to modern games. However, if you can get over that, these are excellent games to experience, with rich stories and provide a lot of background to the later games which you will really enjoy if you're a fan of the series.
Not as good as its predecessor, The Longest Journey, and only worth playing if you want to continue the story before playing Dreamfall: Chapters. The game was made in an era when everyone was moving away from classic point and click mechanics to characters in a 3D world. Unfortunately, the controls and camera are both terrible, and the puzzles are mostly non-existent and easy when you do encounter them. There are also frustrating stealth and combat sections which don't really fit in with the ethos of a story-driven adventure.