That part might have been a joke. But ABBA are amazing, and like in my top two pop bands. The other being New Order.
Queen are really a band of two halves, and even if all you really know are Greatest Hits I and II you can see it - but only if you really know which songs are in which era. In the 80s, Queen were basically your standard big rock band with some frills. At this point they’re defined mostly by rock anthems - Hammer to Fall, Breakthru, Princes of the Universe, Radio Ga-Ga; epic ballady type songs like Who Wants to Live Forever, and a few outliers to their earlier work like I want to Break Free and Innuendo.
Compare that to Greatest Hits I. Queen are still a big rock band, but their work is far more varied and experimental but also very funny. The track listings for Greatest Hits I vary wildly from region and reissue but you can see this from the commonalities between them. Leaving aside Bohemian Rhapsody, you’ve got funk-inspired stuff like Another One Bites the Dust, piano-driven serenades like Good old Fashioned lover Boy, just plain weird tracks like Killer Queen, Bicycle Race and Fat Bottomed Girls, as well as rock anthems like Somebody to Love, We Will Rock You and We are the Champions.
And at the same time, when you look at their albums there’s even more variaiton. A Nght at the Opera is my all-time favourite album. The best known songs on that album are Bohemian Rhapsody and You’re my Best Friend. Outside of the singles that album has a Heavy Metal (by 1975 standards) song calling out their old manager, a vaudeville music-hall ditty, a skiffle track, a folk song about travelling near lightspeed, and especially for @davidm, a prog song.
Queen’s first six or seven albums are amazing in terms of how much work the band put in, in terms of writing an incredibly varied songbook, in recording each style effortlessly, and making it all sound well as an album each time.