The first two-thirds of Zot! (1987 - 1991) are certainly enjoyable enough. Scott McCloud creates a fun, thoughtful, and zany superhero pastiche featuring the invulnerable teenaged Zot and his Earth-pal, Jenny.
Zot fights surreal foes who are rarely menacing, except in their ability to provoke existential crises. The 'villains' often embody abstract concepts, and rare do little more than rant and, er, make art. These portion of Zot! are oddly charming, although not spectacular - perhaps because, as a superhero epic, we're expecting more in the way of action. Or, at the very least, palpable tension.
The superhero stories pick up some assistance from the notes at the end of each arc. I'm generally not so fussed about this sort of whatnot, but McCloud is nothing if not a thoughtful creator. Especially as a reader that's not familiar with art and its history, having McCloud explain his influences and ambitions was surprisingly useful. Similarly, McCloud draws thoughtful connections between Zot! and its autobiographical inspirations as well - how his personal life changed his work (and possibly vice versa).
If Zot! stopped two-thirds of the way through, it would've been an educational read, and an enjoyable one. And that's about the end of it.
But... then there's the final third of the collection, the 'Earth Stories'. Which elevates Zot! to being one of the best comics ever created.