In theory, this should have fixed URF. In practice, nothing changed at all.
Regular URF sucked.
People who say it didn't are the reason why it ended up sucking. They're the people who played the same overpowered Horseshit every game because spamming ranked made them forget how to have fun. Every game had the same 5 champions on the enemy team that felt like absolute garbage to have to play against every single time. After a while, the spirit of Tryhard took over, and you couldn't even do anything "Offmeta" in URF without being flamed. Are you fucking kidding me? Fuck that.
**
ARURF was supposed to fix the issues that Regular URF was plagued by.**
How do you fix the issue of a developed meta in URF? Force it the fuck out by implementing the same ARAM-esque random to it. This was thrilling news from Riot. URF was saved! The original spirit of fun would finally return to Urf, and we could finally go back to having fun! Little did we know, it was bullshit.
ARURF ISN'T random
It isn't. It just fucking isn't. Literally nothing changed. Now that it isn't the last 10 champs you never saw anything besides in URF, it's 10 DIFFERENT champs you always see every game. How? How the hell am I seeing Alistar on the enemy team or my team for 5-6 games in a row? Why does the enemy team always have Fizz? Nidalee? Sona? It feels like the same damn champions every game. Now, part of this is ARAM accounts. Why take the chance of getting a "shitty" pick in URF when you can just stack the odds in your favor? This problem is easily remedied with Riot unlocking all champions during the random selection (which they refuse to do, forcing ARAM AND URF to suffer from this stupid problem). The other part is rerolls. Riot, why the fuck are you babying players in Urf? Ohhhh, you didn't want to have a new experience with a different champion for once in URF? Here have a safety button you're guaranteed to have at the start of every champ select. It'll give you a better champion for Urf Instead. Rerolls need to go. They work in Aram because some champions in Aram are legit garbage, but in URF, anything can work when the chances are truly random of what you'll be facing. Giving players this much agency to cheat the random system hurts the health of the game mode.
Creep
Let's face it. The first time URF came out is nowhere near the same era of league as it is today. Power and mobility creep have run rampant for the game over time, and it shows in URF. Champions that were broken on release and then nerfed into balanced states are terribly broken in URF. The game has changed since URF first came out, and that shift in design philosophy has changed the nature of URF as well. We live in an era where Camille (uhg) has been created. That should tell you everything you need to know about how bad power and mobility creep have gotten.
Riot COULD fix it
But why should they? They have enough on their plate trying to keep live "balanced". Why waste time trying to make URF entertaining to play again? It's not like URF is dead. It will always have a fanbase (as misguided as that fanbase is), and people will always be in the queue to play it. Honestly, it makes sense that Riot wouldn't care to balance it.
** I stand by what I have always felt about URF.**
URF on it's first release was a once in a lifetime experience. You were either there when it happened and got to play it when it was still fun, or you didn't. That's just how it is. Sorry.