Zooropa is great.
Numb is a good song, I'm just not sure it's a good U2 song. I liked most of
Achtung Baby though.
The Orb jumped the shark with
Pomme Fritz -- their remix work is still brilliant but there hasn't IMO been a good Orb studio album since UFOrb.
The Stone Roses jumped the shark with
Second Coming -- although maybe this too escapes under the "anything would be a letdown after
The Stone Roses" clause.
The Happy Mondays,
Yes Please (not so much jumping the shark as snorting it).
The Pet Shop Boys,
Release.
Peter