People are drawn into Queen for different reasons. The list below is obviously a generalisation so please take it with a pinch of salt:
- People drawn into Queen because of Freddie's lead voice will probably be unimpressed by songs which are sung by someone else, so it's not a surprise their 'worst' lists include the likes of Fight from the Inside, Loser in the End, She Makes Me and most of the Flash OST.
- People drawn into Queen because of Brian's magnificent (May-estic?) guitar solos which are both melodic and heavy and/or with some interestng harmonies will probably unimpressed by songs where all he does is a more straightforward rock solo, such as Coming Soon, Drowse (where there's no solo, actually) or even Tenement Funster (which I personally rate as one of his best solos, but it's not in the style of Killer Queen, Let Me Live or Days of Our Lives).
- People drawn into Queen because of their musically-complex epic material with peculiar structures, loads of odd chords, interesting modulations and so on will be less impressed by simpler more 'basic' songs such as Loser in the End, Rock It, Sheer Heart Attack or Ride the Wild Wind. Unlike Frederick (and to a lesser extent John and Brian), Rog was vocally opposed to modulations and overcomplications, so his style was different. 'Ga Ga' was such an anomaly in that sense, but coincidentally that is one song of his that Fred took over and re-arranged.
- People drawn into Queen because of the lush layered vocal harmonies will likely be less impressed by the likes of Modern Times R'n'R, More of That Jazz, Calling All Girls or Don't Lose Your Head, which wouldn't hold a candle in that department to the likes of My Fairy King, You and I, '39 or Somebody to Love. Fred was a backing vocal specialist; Brian arranged some beautiful and really interesting parts from time to time, and even John had a couple of instances ... Roger, not so much (perhaps the ending of 'I'm in Love with My Car' is the only case).
- People drawn into Queen because of the multi-tracked guitar harmonies will likely prefer the likes of 'Millionaire Waltz', 'All Dead' or 'Master-Stroke' rather than 'Coming Soon', 'Sheer Heart Attack' or 'Action This Day'.
- People drawn into Queen because of the unique piano playing (not concert-pianist material, but still interesting and distinctive) will likely prefer the likes of 'Don't Stop Me Now', 'Love of My Life' or even 'Leroy Brown' rather than most of Roger's songs (out of all his compositions for Queen, only four or five have acoustic piano, and never as a main instrument - often just adding overdubs and superfluous ornaments).
- People drawn into Queen because of the melodic bass playing will likely be more drawn to ballads (Teo Torriatte, Save Me, We Are the Champions) or more adventurous material (Master-Stroke, Waltz, Leroy Brown) instead of the bland 'bass plays the root and/or doubles the rhythm guitar an octave lower' approach used a lot by Rog (Car, Modern Times, Action). 'Days of Our Lives' has a beautiful bass-line, which is why this one's usually well-liked by those people.
I suppose the stereotypes mentioned above make up a sizeable portion of the Queen public, so there's your answer. I personally like his songs a lot, and some of them are quite underrated indeed. They make the seventies albums even better as they provide a valuable change of pace and Roger's voice is stupendous. But yeah, if I were to choose between Ogre Battle and Loser in the End, between Teo Torriatte and Drowse, between We Are the Champions and Sheer Heart Attack, Don't Stop Me Now vs More of That Jazz, Sail Away Sweet Sister vs Rock It, Save Me vs Coming Soon (in all cases I'm choosing two consecutive album tracks), Action This Day vs Put Out the Fire, Princes of the Universe vs Don't Lose Your Head, I Want It All vs The Invisible Man ... yeah, Brian and Frederick wrote way better songs overall... by far.
John hated Hot Space. Frederick's favourite singer was not Paul Rodgers. Roger did not compose 'Innuendo.' Witness testimonies are often inaccurate. Scotland's not in England. 'Bo Rhap' hasn't got 180 voices.