Who's the worst champion to fight in URF?

There are so many I hate to fight in URF and it gets tiring to see the same one over and over (STOP APPEARING {{champion:28}} !) while they never get on your team. I figured I'd ask who is the worst champion in URF to fight. Also, why is it when the enemy gets Yi, our team is squishy yet when our team gets Yi, the enemy is tanky and CC heavy? *sigh* Anyway, who's the worst in your eyes for urf? Up to 5.
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