He had lots of smaller imprint and indie stuff, but I mostly wanted to read the heavy hitter superhero stuff to start.
I read the entire Marvel Ultimate series, Spiderman, X-men, Fantastic 4, Ultimates, and a bunch of 1 offs, up to and including their final "ultimatum" event, plus a couple of the "Ultimate Comics" that started after that. Some of them were very good, especially The Ultimates (the Avengers of the ultimate universe), some were weak. Overall pretty decent. Plus a few other normal universe Marvel collections here and there, a couple X-men, a couple Avengers, an X-factor.
A few scattered Batman collections, some very good (Year One, the War Gangs saga, Hush) some okay (Haunted Knight) and some awful (All-Star Batman and Robin). On that last one, I finally realized that I really dislike Frank Miller. Year One is the only thing I've read of his that I've enjoyed. I really disliked The Dark Knight Returns and All-Star Batman and Robin was really vile, tone-deaf, stupid, and violently written. I don't mind violence in comic books, often it is really effective in the storytelling or exciting in the action, but Frank Miller seems to write violently.
Then I read a bunch of DC universe continuity, mostly starting around Identity Crisis (which was really excellent, definitely recommend) through The OMAC project on the way to Infinite Crisis (which wasn't awful, but overall not very compelling) and then a bunch of smaller stuff from there, including Justice Society of America (which was pretty fluffy but well done) and Checkmate (which at its best was a mix of international intrigue and spy stories with superheroes!!!) and Secret Six (sometimes over the top and gratuitous, but did some really clever things and pretty well written and drawn).
Then Final Crisis and Final Crisis Revelations, which swung wildly between great and ridiculous. I think Grant Morrison can be really brilliant at times, but he tends to favour the overblown and convoluted too often. Then a few other DC alternate universes, like Kingdom Come and Superman: Red Son, and then on the DC imprint Wildstorm I read Planetary, which was slow to get into but got really good.
To finish up I'm reading the first 4 volumes of the DC Starman Omnibus collections, and the Batman: The Long Halloween. Then I haven't decided whether I'll go back to fiction for a while, or start getting more comics from the Library.
When you're asked what your weaknesses are at a job interview, look lovingly into their eyes, place your hands on theirs and say: "You".