Additionally to all the well written, but more techinal-focussed posts before, the Fallout series feels more gritty and suitable for kinky mods than Skyrim, if I dare say. Skyrim simply is too clean. I guess it's fair to say that it only became so heavily modded because it had the right combination of available modders, a stable enough engine with looks and sounds - plus the simple fact that modders were able to add more advanced techniques into the game. How would play kinky Skyrim if modders weren't able to add HDT, and SMP later?
In short, if you like the feel of the Fallout universe, you wont miss the Skyrim modding world not as much.