Ocean’s Eight is a low-tier Ocean’s movie, but it’s still enjoyable. If you like the other films, you’ll have fun with this one, too.
Ocean’s Thirteen is good fun, and a definite step up from Ocean’s Twelve.
If you liked Ocean’s Eleven then you’ll probably still have fun with Twelve, but it’s not as good.
You want to have a fun time watching people rob other people? Watch Ocean’s Eleven.