'Tango' definitely has an '80s sound... how can it not? But I don't think it's dated in a negative way. It's a document of a certain period in music, and it reflects that... but not in a crass, over-the-top way. It shimmers and sparkles, and employs only the best aspects of "that '80s sound."
At least in my opinion.
Personally, it's still one of my favorite Mac albums, and I love listening to it thru headphones.
