Never read I am Legend, so I can’t very well comment on that (though I have seen both the Heston and Will Smith versions).
I, Robot was a collection of short stories. I don’t really see how you can make a movie based on that which actually followed Asimov at all. Most of the shorts are quirky little things, not really script worthy. You might try doing the R. Daneel Olivaw stuff (Caves of Steel etc.), but I’m not sure how much appeal those would have.
Starship Troopers has the makings of a good war movie with lots of good action and thought provoking content. It could be made into a good movie if someone actually had that as a goal.
Also the Vincent price version.
Doc savage. The first with Ron Ely and the new one that hasn’t been released yet.
The director did iron man 3. And that’s all you need to know.
Harlen Ellison wrote an adapted screenplay which was published as a book in the 1990s.