Can you please explain some of the usages as well?
It is a compliment - what is there [about the thing we're discussing] that someone wouldn't like? Nothing, right? So for example, discussing a vacation possibility:
Language being what it is, people sometimes use it sarcastically to emphasize how much they dislike something:
Without context nobody can know which meaning is intended so please edit your question to include where you heard it and what you thought it meant (from tone of voice and reactions of others.)