Sure, the Let's Dance period wasn't really so bad as some protest. And if he'd have sufficiently moved on from there into a less pop direction so uch the better. But to go even more mainstream was unexpected, and even he, himself has lamented this period as his nadir.
I do like a few songs from "Let's Dance" 's follow-up, "Tonight", but on the whole it fails to capture me. Sadly, that Glass Spider Never Let Me Down thing that came on the heels of it was utterly embarassing. He *had* to do that Tin Machine rock band experiment to shake that slime away, and all the newfound fans with it.
For the most part, his 90's period was all about returning to music as an artform. "Outside" remains one of my top five all-time favorite albums by any artist - it's breathtaking.