Most artists (anyone creative really, including writers and even chefs) don't like the work they do, forever seeing the flaws that only they know about. I suppose that sense of self-criticism and perfectionism are how you truly know you're an artist. XD
Anyway, I enjoyed Doom, both the story and artwork, and I liked this version of Superman a lot. Something about the design takes me back to my childhood, coming home from school and watching the first Batman cartoon. I think in Doom it was also one of the first times I liked Green Lantern.