Is aram supposed to be fun

That's a mark/dash problem. If rito listened to people who knew how to play melees on the map it could still be a balanced and fun game mode.

Use it as a tool.

Just take the time to try and dodge all the skillshots.

Not always. I once got an entire team of tanks with zero poke and beat a heavy mixture of tanks, pokers and Poppy and won.

######But yeah very often it is.

While I generally play a lot of ARAM and do consider it pretty fun, I agree that the champ select seems very... off, somehow. The "random" aspect of ARAM never really seems random to me, as inevitably one team will be loaded with melee champs and the other with poke-heavy ranged champs, or you get a squishy comp against four assassins standing behind a tank, etc. Could simply be saltiness from my (admittedly numerous) losses, but it definitely seems like the more I play, the less random the mode is. I'd be curious to see how the algorithm for the champ select process works.

That being said, if you try to use it as practice for dodging skill shots and attempting to better your positioning in teamfights, it still turns out to be a useful mode, even in it's most frustrating matches.