There are two things that bother me in URF...

No, it's not the toxicity, as much as I would like it to be.

1: Death timers; for a match where every person can take down two turrets at minimum in a minute (and some champions entire rows) they are far too long.

2: Tank items. No, being tanky isn't a bad thing, it's just incredibly frustrating and results in an enemy champion being unkillable late game. Galio and Warwick can be pretty big offenders for this. Items like Abyssal Scepter and Rylai's are perfectly fine, just items like spirit visage making it near impossible to dent them meanwhile they heal all the damage dealt in a single spell.

Don't get me wrong, URF is fun, but there are still problems that persisted since the first one. And I still think, even though the first one was horribly skewed in balance, that it was the most fun, since every champion could have something that made them strong.