For as janky as TES games are, I appreciate the variety and then I can play the games however I want. Playing as a preset character in an RPG isn’t a dealbreaker for me (though I find Geralt tedious) but if I can make my own I’ll be more willing to overlook the other flaws in the game.
That's the main reason I like Bethesda-style RPGs, playing anyway you want. I have no issues with always playing with Geralt in Witcher, the problem is that his skill set is presented at the beginning of the game, and the only thing you can customize is to focus more in some skills. It would be nice if following Witcher games allowed you to to create your witcher and choose your school, which could function as a class. In the Witcher lore there are schools that specialize in assassination for example, there are also many mage schools. So the possibility for customization is already there.