Most of Haydn's symphonies are... boring (Disclaimer: IMHO, to me)

Sorry, I just finished listening to the whole bunch and most of them sound uninspired and "blah blah blah" to me. They sound pretty, yes, but I don't find any substance to them, something that would make me really pay attention to them more than when I'm just listening to pleasant background music without an intent. It's not that I can't recognise Haydn's talent and technical prowess, either! And I insist, I find them beautiful no matter what.

OTOH, I found that a few symphonies from 90 onwards caught quite better my attention and I liked them more.

Can you recommend other works by him that I may find more amusing? Or at least different works that can help me have a better vision of all of his work.

Thanks!

EDIT: Thanks so much for your replies! I was going to listen to his other works, anyway, but now I have a clearer view on what I may be enjoying best next, according to your recommendations. :-)