You're in luck, I just posted my review (complete with pictures) of our Lunch Buffet at the Pepper Market back in February. The link to the review is in my signature.
I don't know that I'd go majorly out of my way to eat there unless you didn't want to eat lunch at any restaurant in the park you're spending the day at, Hollywood Studios comes to mind for that since its close. Also if you were at the Animal Kingdom and didn't like their lunch offerings then it would be reasonably close to catch a resort bus there and back. If you've got teenagers who eat a lot and you want to fill them up cheaply then its also worth a try. The food was good, but not schlep across 3 bus transfers good. Now if you'd done early morning EMH somewhere and were heading somewhere else for the evening (DTD, etc) then it might be worth the detour. I would however definately eat there if I was staying at CSR.
I guess what I'm saying is its good, but its not Boma-good.