As I said I was recently shocked by how banal many of the mainstream comics in collection seemed. This prompted me to reexamine the comics in the superhero/action/science fiction genre that I still think are awesome, and what made them so.
Take for example the early Fantastic Four, and I don't know, maybe even the Byrne era FF (I do like Byrne quite a bit, or did when he was really on top of his game). The FF drew as much on early pulp traditions of scientific adventure and exploration like Jules Verne and Alan Quatermain. They were discovering new civilizations, new dimensions, rare elements and fighting monsters. There was a sense of wonder and discovery to these stories, much as found in Dr. Who or Star Trek. Plus, they were a family as much as a team; their relationships were intensified by the dynamic. They weren't just in it for the glory or the paycheck, they were in it together.
Early Spider-Man was also unique. He was weird looking, with the red and blue spider pajamas that covered his head completely, jumping around and cracking jokes. Not to mention the unique abstraction of even the most pedestrian Ditko pages. Spider-Man was also Everyman; struggling, poor, rarely got the girl, lived with his Aunt. He was no playboy with a secret lab and unlimited bankroll for his war on crime, nor did he have a satellite or a secret station beneath the North Pole.
There are other books through out history that bring us these fresh approaches to the genre, often reinventing what worked before, often coming up with something completely unheard of before; The Authority, Planetary, The Invisibles, The Atomics. There have even been, in my opinion, some really great mainstream books by Marvel and DC in the last 10 or so years; X-Men, Astonishing X-Men, JLA, X-Factor/X-Static, which is why I don't dismiss the genre completely.
However, I must admit, one doesn't have to look far or hard to see a great frothy sea full of deadwood, detritus, algae-slicked lumps of putrid waste, and vast chunks of tepid, banal clumps, all floating listlessly about in fetid green water, chocked of all it's refreshing or nurturing qualities, the air shimmering with the repugnant odor of stagnation.