The issue is a lot of these quests require multiple runs to fully earn all the exp, so while the orb may earn you more, you are essentially getting less PER GAME now since you are either going to do your 5 games/orb or you're going to try and complete the quests.
I would think 48 hours would probably be the sweet spot. 5 games in 1 day was far too much, but this feels too far apart -- at least with the current quest structure.
EDIT: So apparently all we get is 300 experience... for 3 days. that's 100/day.
We used to get 120/day. I guess this has something to do with the "longer season" (i.e. LESS rewards)