One thing I didnt like about Fallout was having to assign points before hand as you never really know what situation you'll find yourself in. In Oblivion you gain experience from using a certain ability the more you use it and not having to set it before hand. I'd like that on Fallout; the ability to be more proficient with a certain weapon type the more you use it or a certain ability the more you use it such as hacking, it makes for a much better gaming experience in my opinion.