There's a lot of fun stuff in FO4, but the inventory, equipment system etc. feels beyond dated now. And they've had so many opportunities to update it between FO sequels and Skyrim that there's no excuse any more. My biggest issue though, might be the inability to rebind keys probably and the gunplay that just feels off. Plus the fact that it's based on levels so certain enemies will take several headshots to go down even though their appearance and armor is the same as their lover lever counterpart.