"All Random" must be the biggest joke I've ever heard
It is not random. There's no way that a random system could have net Evelynn every game out of 138 champions. +the occasional Yi/Heca/Vlad/Xin (not "instead of" Evelynn... in addition to Evelynn).
Where are the Udyrs? The Trundles? The Ryzes? C'mon, don't tell me nobody unlocked Ryze.
We all know why this is: it is not just because everyone has at least one of them (cough haven't seen a single Ryze yet cough), but mostly because of rerolls and dodges. It is as if people were playing regular URF, and you are guarenteed to go against at least one of the URF meta champions.
But if it is so, then what is the point of having made it "all random"? If people can just pick the same 20 champions anyway, then why do we call it "random"? Let's face it, this is regular URF with more dodges and way more stomps.
P.S. This is a problem in ARAM too btw, and has been ignored far too long.