I'll give you an example of how I typically use each.
I blame Rito for my flashes that don't quite make it over walls and ignites/spells that don't quite kill the target. If they were smart and would make my spells do 10 extra damage and my flash would always go where I want. Everything would be cool if they'd just listen.
I blame Riot for my lack of warding in bot lane right now. I didn't like them taking away the ability to purchase wards, since now I have to choose whether I want to ward the bottom lane wall bush, or the bottom lane river bush. Either way, we likely won't see the enemy jungler coming because we don't have enough wards to watch for it. Being blind in a meta that has so many mobile junglers with a form of cc just isn't fun.