I guess everything is relative. I have a Koralia 1 on the middle back of my 10gal frag pointed forward and consider it barely adequate.
Good beginner softies are larger shrooms (especially purples and greens), palys, most zoas. To be honest I consider LPS like Acans and Candy Canes to be just as hardy as softies and have the same generous lighting requirements. While Xenia thrives in a lot of tanks, I've found it to be rather fussy and prefers very even water params.
Softies and easy LPS don't *require* feeding, but it will encourage their growth. Also, unlike SPS, they like some nitrate in the water, and shrooms / zoas will grow rapidly with some nitrate hanging around. I occasionally feed with either zooplankton or oyster feast a couple times a week, but *only* if your nitrate levels are low. If your nitrate levels are rather high, and beginner tanks usually are, it doesn't do you any good to make the problem worse by adding food.