In my opinion, ARURF can't be fun.
It's impossible. There is actually no way for ARURF to be fun. The likelihood of you getting a champion that you want to play (thus = fun), is very minimal. Only one of that champion can exist, so if you don't get it, there's also a chance that champion's on the enemy team (thus = not fun). Furthermore, if you're GOOD at the champion you get, your experience actually playing the champion for that game is minimal, because the game will go by quickly. Even worse, there's a LOT of toxicity in League of Legends, and these problems cause and are affected by the toxicity - Someone who had a lot of bad rolls will be more likely to trash talk in all chat, to flame their team, and take a silly, fun game mode.. very seriously.
To hell with "oh it's always the same champions every game". Remember original URF? 6 bans (3 - 3), and then you pick your champions. I say bring that back. At least then, your games are of your own choosing.