Why would you avoid it?
I think people might avoid it because of the fat content, but there is a whole lot of thought lately that the whole trend of avoiding dietary fat was a misdirected idea. Fat is high in calories and should be eaten with that in mind, but naturally occurring fats are not nearly as harmful as many ppl think
When it comes to advice about food, everybody's got their own opinion. Some still avoid fat, while others say carbs are what needs to be avoided. Yet others say everything in moderation and don't avoid anything.
What you need to do is gather information and knowledge and make your own choices. Don't go by someone saying "you shouldn't eat Greek yoghurt" and you don't even know WHY you shouldn't do it. YOU decide what to eat and what's healthy for you, you know how your body reacts and what makes you feel good or not. Of course there are some general guidelines considering nutrition etc, but when it comes down to it it's your choice. But you need to know why you choose it.