I was never fond of the walking simulator thing on the first place, but the concept was best used in Honest Heart imo.
- You have the sound of the environment instead of the music.
- You have a lot of quiet moments to enjoy the environment.
- Not everything you see wants to kill you. There are bighorners and peaceful tribals.
- No raiders, ghouls and super-mutants.
- As it was only wilderness, so you don't feel the scaling issues of the main game (every settlement being way too small and way too close to each other, despite the ingame travel being long enough to be boring)
- It was actually beautiful.
- The companions don't follow you forever, so you don't feel much of a loop in their dialogs.