Agree. But they're well in second and third compared to Calvin & Hobbes. :)
I also think Bloom County deserves to be on the list of all-time greats.
...theological?
Theological might not have been the best word but there's definitely a lot of spiritual insight offered up in C&H.
None of them reach the meta level of social/theological commentary that C&H did, but they're still really, really good on their own, doing their own things.