Swirling Saucers is a basic spinner, a fun little C Ticket that barely makes it over the threshold from being a B Ticket.
It was a cute add-on for Cars Land. But of course in WDW, it was a MAJOR NEW ATTRACTION! that had to help prop up an entire new land that had only one other new ride in it. That's not something any C Ticket is supposed to do. But out in WDW, they try and pretend a C Ticket can do that duty and they get interns in a Celebration cubicle farm to Tweet about it as if it was only slight less exciting than Pirates of the Caribbean.
At Disneyland, Mater's Junkyard Jamboree is simply a rather fun little C Ticket spinner with a cute theme.
At WDW, it's one of two small rides designed to prop up an entire new land in a theme park that has less than 10 rides. The result of that strategy in WDW was predictably tragic.