I've only recently finished 'Voyage', and while I enjoyed it I did have some misgivings. It did feel as though the author had basically gone through history, scribbled out 'Moon' and put 'Mars' in its place. Changing Aldrin for Muldoon seemed at times more a way of avoiding libel claims by Aldrin!
I'd also like to have seen more from the actual Mars mission itself.
Including this one I've now read three in a row where the book's ending leaves you wanting to know what happens next - which I suppose is a good thing.
A good read, but probably better if you aren't as steeped in Apollo's story as we are here.