What are top 5 worst champs to play in URF

In theory: Rumble. All of the benefits of this mode do nothing for him since he's completely gated by his passive. You can only cast X rotations before he silences himself for 5 seconds. Something that's already easy to accomplish without a single point of CDR.

Anyone with health costs, you literally start killing yourself :P

I think are pretty bad. esp early. Rumble still overheats which isnt fun to deal with.

Rumble - Having lower cooldowns just makes him overheat faster.

Singed - His poison is his main source of damage and CDR doesn't help it. He does have his ult always on at least.

Nasus - Can stack faster, but even having permanent Wither doesn't seem to stop him from being kited or CC'd to death.

Yasuo - His Q and E don't get any benfits from this mode. He just gets to Windwall and ult more.

Tryndamere - When AD, he can't abuse the lowered CD on his heal because it destroys his Fury generation. And even with his low CD spin and shout, good luck trying to stick to someone without getting blown up, CC locked, etc. His AP build is a little better, but just not as good as other champions.

rumble

Singed is fine, he just runs away and bes that other piece of crap, probably equal or worse than .

Fiora is fine as well, just q once and ult, then start spamming.

Draven is meeeh.

The rest do suck.

Damage over time champions imo. Tried Cassiopeia the other day, worst time i've had yet in the mode.

Draven is good. Buy Sword of the Divine, it has near 0 cooldown. You always have 3 autocrit axes ready to go, everybody dies.

I had a a particularly bad experience as Corki the one time I tried him. Not sure if it was just bad luck or what, but he got completely demolished in lane and I wasn't able to catch up until the team helped me feed lategame. Seems like Corki just doesn't get as much benefit from the URF buff as other champs do, and in general falls behind. (although constant machine gun is nice, and post-6 his poke is amazing with his ult)