I don't feel like doing even my normal quick reviews for these, so here are some very quick reviews:
The best of the lot was the Fantastic Four (What If Doctor Doom Had Become The Thing?), but then I've always liked Karl Kesel's FF, and it's always a treat to see art by Paul Smith. Peter David & Pat Olliffe's Hulk (What If General Ross Had Become The Hulk?) was good too. The Spider-Man one (What If Aunt May Had Died Instead of Uncle Ben?) was okay, even if it took a few jumps in logic.
The two by Bendis (What If Jessica Jones Had Joined The Avengers? & What If Karen Page Had Lived?) were pretty bad. The worst offense they both made was to spend half of the issue recapping what happened in the 'real' Marvel Universe, which only left a few pages for the actual story, which was told in summary fashion rather than as an actual story. The worst of the lot was the Daredevil (...Karen Page...), wherein Matt Murdock's actions really made no sense at all, and weren't compelled by the change in history, just DD deciding to do something different.