The controller feature in Diablo 3 was to roll in whatever direction when you pressed the right stick. In Diablo 4 they've changed it to a dedicated button. Most of the "aiming" in Diablo games is automatic. You just attack the highlighted enemy based on the direction you're looking. The challenge comes from moving out of the way of bigger attacks, and knowing when to best use each skill and manage your cooldowns and energy. Every ARPG generally works like this on controller.
Maybe try a different ARPG if Diablo 4 would be your first, before you spend 70 dollars. They're a lot of fun, but if you go in expecting a dual-stick shooter, that's not quite what you'll be getting.
If you have PS Plus Extra, maybe try something like Warhammer Chaosbane. It's a budget ARPG that I played years ago. Maybe play an hour of that and then decide if you like the gameplay. It's VERY repetitive when it comes to content, though, so don't judge Diablo 4 from that game, but it will give you a good idea of how it feels to play an ARPG. I wouldn't keep playing it though.