Have to say, I was thinking the same thing until I played it. URF? Yes! Random? Sure, I guess....trying new things, etc.
After a few games? So done. Not worth it. I'm positive that some champs are banned as a result of Riot trying to "balance" the mode (but isn't that the point of URF; to be slightly unbalanced?), but not once have I gotten a champ I can play well. And for those I can, I can't trade for them, can't reroll them, and if by some MIRACLE that I can play one or try to be decent, the opposing team somehow gets the jackpot with A+ comps and the whole game is a slaughter. And if that isn't good enough, there's still the other 9 players that may AFK, rage, or feed. But being in URF, this all happens in a shorter time frame, so surrenders can't or don't happen and we can't avoid humiliation. In the end, lots of unnecessary anger and an ultimate waste of time.
For those that enjoy this mode, good for you. You're lucky (though it may not last). But I will let this sit untouched. It's not worth the trouble.