I'm sorry, but I dislike it a lot.
I see no comeback - it's dated, it has a bad sound and it doesn't look good.
However, it isn't that bad, you can get
Greta as a nickname.
I prefer
Gretel, I don't get why it didn't become popular.
“Dear optimist, pessimist, and realist – while you guys were busy arguing about the glass of wine, I drank it! Sincerely, the opportunist!”
-Lori Greiner