FL is a mess. As a dumb turn my brain off mode it is amazing. But:

* Too many players. There is no thinking from 90% of the players. It is ball up and smash skills. Those of us who play it tactically solo, often find great success, but it is sad feeling like I am culling preschoolers instead of actual adult players because of how brainless they play. Current favorite strat seems to be pick Astro and spam Gravity from the smooth crowd.

* Too much DR: I have lived numerous times with half a dozen people hitting me because the DR baseline is so bonkers. I understand why it HAS to be this way, see point #1.

* Low EXP: Short of the daily bonus, there is basically no reason to play this mode.