I mean, they’re very different games… If you’re looking for something like overwatch, then seems like it could be a good match.

And yeah, the League new player experience is god awful. Even by people who still play it, it’s known for its toxicity. Riot let it degenerate into a cesspit because moderation was too difficult/costly, which caused all the friendly players to abandon ship. That means that the only people who still play are either clueless, toxic, addicted, seeking to profit, or somehow immune to vitriol.

Sadly, if you want a casual moba, I’m not sure it exists right now. Maybe ones that were never obscenely popular and still have passionate communities? Smite, HoN, Eternal Return?

If you just want a casual game, then yeah, best to get in with a game that has a lot of other casual players, and Rivals fits that bill right now.