That Elektra omni is pretty crazy. I read it recently and realized I had read it when I was much younger (probably too young), but it's still kind of shockingly dark. I personally liked it quite a bit, but the Miller/Janson DD omni is my favorite.
I'm almost done with FF by Byrne vol. 2; I actually enjoyed this more than the first omni. Mainly because of She-Hulk, who brings some needed freshness to the series, but there's also some actual character development in this volume. I was bored stiff reading the first book - very one-dimensional characters and not much drama either. Galactus and Dr. Doom were the best parts, and of course the beautiful art. Not sure if I liked vol. 2 enough to re-buy omni 1, but I'm glad I read them.
I'm also reading Tomb of Dracula omni, finished issue 12. This has been a huge surprise, much better than I anticipated. Starts strong and then slows down a bit, but I'm excited to read the rest. The art is fantastic, the premise interesting and the stories and characters have been much fuller than I thought it'd be. The only Dracula in Marvel comics I'd encountered before was in the Uncanny X-Men issues he guest-starred in, and I didn't care much for those.