Itās not hard to see why they were so popular in 1970s USA, given that they were effectively a refined hybrid between the dominant popular music forms of that time and place (classic rock, soft rock, country, and Carole King-style singer-songwriter).
For what itās worth they did it pretty well too. They werenāt groundbreaking or radically innovative songwriters even for their time, let alone 2021, but Glenn Frey and Don Henly both had a really strong command of melody and harmony. Even Hotel California, as overplayed and over-quoted as it is, has a lot going for it, including a pretty interesting chord sequence. In particular I have a bit of a thing for the tension created when a chord progression has both the minor and the major forms of the same chord. Plus, haters be damned, that guitar solo is pretty much perfect.
Anyway, Hotel California is a pretty good album and they have a load of great tunes. Donāt love them but I do like them a lot so I think itās a 4 from me.