It's a matter of preference. I didn't know that before, but now I do so I understand.
As far as standards of anime go, having watched a great deal myself and being at least something of an "otaku", I would say that Suzumiya breaks the mold and parodies a lot of the standard anime conventions. The pacing and style are rather fresh, the artwork is crisp and the series takes older concepts and either effectively parodies them, reinvents them, or both.
It's not a bad series by any standards, and I'm all for people choosing their preference. However, I tend to find it a bit alarming when people write a really good series off for no discernible reason.
Consequently, with your preferences I highly recommend Spirited Away and Princess Mononoke by Hayao Miyazaki. Mushishi actually follows the formula of both of those movies quite closely, they're extremely similar.
And on that note, that's one of the things I enjoyed most about Suzumiya. It started off looking like a conventional high school drama, but they allowed it to spiral into extremely amusing (albeit often ridiculous) areas. It's genuinely funny with an amazingly good script and just the right touch of serious elements to make it a thoroughly enjoyable experience.