Here and here are the best description I've seen of what it's really like to write mainstream comic books.
It's a field with demands and methods as specific and unique as writing for Hollywood, but often considerably less pleasant for creative types. Not to mention much less renumerative. Please note, you do not need to have any interest in pervy millionaires who dress up as giant bats or science nerds who get bitten by radioactive spiders to find the above links informative and interesting. But if you are one of those people, you ought to read this.