As with most buffets (Mandarin being a possible exception) My Big Fat Greek Buffet is about quantity over quality. Not to say that anything is bad. It's not. But almost any item ordered elsewhere on its own would almost certainly be better.
That said, there are a number of Greek favorites including moussaka (probably their best item), stuffed peppers, and souvlaki (though small, often dry, and sometimes unavailable without a little bit of a wait).
Accepting things for what they are though, if you're in the mood for a variety of Greek food, My Big Fat Greek Buffet will hit the mark.