I've got the Busiek Iron Man Omni but haven't read it yet. My roomate in college picked up the comics each month when it was coming out and he liked it. I've wanted to read it but just haven't found the time. I generally like Busiek as a writer most of the time.
So in my college days I regularly picked up Avengers. I remember Busiek's Avengers was an unabashed throwback to classic Marvel bronze age type of stories. I've read it over the years a couple of times and mostly like it. You have to remember what a train wreck the Avengers book had been for quite some time until he took over. Starting in the late 80s when Simonson came on board as the writer the team consisted of The Captain (Steve Rogers), Gilgamesh the Forgotten One, Mr. Fantastic and the Invisible Woman and Thor. Not exactly a super top tier line up. Eventually the FF duo left, She-Hulk, Sersi, Quasar and others arrived and it was okay. The the 1990s ... yeesh. Leather jackets and stubble and grimaces galore with gems like Operation Galactic Storm, the Collection Odyssey (or whatever it was), Bloodties, and The Crossing. Finally Marvel gave up and let Liefeld take over for Heroes Reborn. Which was actually somehow worse than all that preceded it. So when Heroes Reborn came along, having the big guns, top tier Marvel super-heroes on the book again, it was a breath of fresh air.
What I liked about Busiek's Avengers run: throwback style, big guns in the lineup with a few new faces scattered in. And George Perez. The man can just flat out DRAW. I particularly liked Justice and Firestar "graduating" to the Avengers from the New Warriors, and I really dug the inclusion of classic B-list members like Vision, Hawkeye, and the Scarlet Witch & Wonder Man. Also Avengers Forever. That was awesome: An all time classic time travel caper with a great cast and great art by Pacheco.
What I didn't like about Busiek's Avengers run: Too many new faces that didn't really catch on. Triathalon, Silverclaw (or whatever her name was) and the Triune (the psuedo-villainous group that made Triathalon). Also it kind of ran on too long. By the time he left the book, Marvel was entering the Joe Quesada/Bill Jemas days where continuity was purposefully ignored or deemed a cruch and things just didn't work out. The ending of his saga with the Kang War was pretty great but it had absolutely zero ramifications for anything other than the Avengers book. And so what could have been a massive monumental event for the entire MU just sort of petered out in the Avengers book.
In summary, I think Busiek's run was one of those runs which seems great at the time, and was, but it definitely needs to be enjoyed for its time period. Now looking back 20 years later (!!) it just seems kind of "okay" and not as good as it was back then.
Women of Marvel ... man that was a dog! I remember seeing it on clearance prices for like $20 at one point. I forgot all about that one.
I'd buy one of those and that would definitely be an out-of-left field weird choice for an Omni! IIRC, they released a TPB several years back of the early Spider-Ham issues. He pops up every once in a while when they have a universal crisis with all the Spideys pull in from various continuities (Spider-Verse, he showed up in some of the animated shows, etc).