I really like this kind of events, since you can do it without much stress on auto and without spending any extra resources. But I really like the grinding part of the game.
What I really don't like is the luck part, but that's the game, so I don't really cry about it. I've never earned any event character during the event itself, today wasn't any different, 10 more 3*.
I would love if they would put some absurd numbers on top of the usual event stuff for extra grinding, like 15k grevious burn, 10k seal, whatever, but with a garante that we get the toon.