I agree, the 2000s is their slump.
The '90s kicked off with their most successful album by far, which they toured for years. Then they released a double album (which while not great, is still miles better than anything that's come since), and there was Garage Inc (the new material, obviously) and S&M, which were both alright.
Since 2000, they've recorded 2 albums universally considered dog shit, and another that is a poor rehash of music from their prime that only highlights that they're not in their prime any more, and a doco movie that shows how far they've fallen.
The 90's was not up to their '80s stuff overall, but in comparison to what they've done since, I'd gladly have that back.