'However, it should be kept in mind that most of the music by "minor" classical composers will appear rather lightweight compared to the famous pieces by Mozart, Beethoven, Haydn.'
- Jo498
I've found Gluck's music to be exciting and beautiful, more than the other "transitional" composers from Baroque to Classical, and more than the minor Classical figures. I also have a suspicion Gluck was writing in the mature classical style before Haydn. It is hard to demonstrate this however. The opinion on his quality, as opposed to the timing, is regarding the sound of the style, because as an opera composer Gluck of course didn't write in Sonata form or any of the other appurtenances of the symphony. For wonderful Classical orchestral writing however, in his overtures, ballets and accompaniments, he ranks in my mind a lot higher than the position which posterity awards him.