Ha, ha, ha. They focus on selling the game to console gamers, yet we PC Gamers get the better deal in both performance and additional content thanks to modding.
Well, aside from sensitivity, custom keybinding, memory, texture, and miscellaneous issues, but come on, it's Bethesda! They make great game concepts, but fall just a few inches short of reaching the grand conclusion to their master plan--the games are fun and awesome and on a large scale, but there's always these little nitches where you feel like something should be there, but it's just a little hole...
...and then mods come along and fill the hole with unofficial patches, bug fixes, graphical enhancements, new weapons, armor, spells, creatures, quests, lands, homes, characters, technical tweaks, improved gameplay mechanics, better menus, increased customization, etcetera etcetera.