That's not how I remember 1981- 82.
Right up to the first performance everyone thought ALW & co were out of their minds. The show opened and BACK THEN seemed like the most innovative, happening show since, perhaps 'Hair'. Of course there was a wave of hype, but it was generated on both sides of the Atlantic. Broadway was as desperate for this hit show to arrive as Really Useful and Cameron Mackintosh were keen to transfer it!
Just like with 'Les Mis' a few years later, 'Cats' then became as others have recalled, the "prestige ticket" (as ridiculed in 'American Psycho'
- and we see that phenomenon today with 'Hamilton': guys showing they have enormous penises because they could afford to pay $500 for a ticket.
Ultimately, there seem to be 2 strands of hatred for 'Cats':
a) those people who just hate the content and think it's dumb and reductive (I agree)
b) those who object to a perceived cultural imperialism with the Brits throwing their weight around in America's home-grown theatre form. This, I think is a little unfair, since there were plenty of Americans who were very keen and happy to take a slice of the action from this license to print money.
The trend for British pop operas declined- as all things do- because the novelty wore off and people wanted something new, (principally the jukebox musical- so there was a real improvement!)
(I currently dislike 'Cats' for the the way ALW once again shows disregard for other artists, junking Gillian Lynne in a highly disrespectful manner, as documented in 'The Stage' this week.)