I picked up the first issue of Minutemen, largely out of curiosity and I ended up buying it, it was pretty good. I'm a huge Darwyn Cooke fan so maybe that isn't the most objective view of the whole prequel series, and I might not like the others so much, but it was a decent retro style comic, a dark and serious golden age homage, a little slow to start, but it seems like a fun series, worth giving a chance.
I would definitely recommend it to anyone who liked Cooke's Final Frontier or his Spirit series. To compare it to something not by Cooke, I'd say it reminded me a little of Mignolia's Lobster Johnson mini's, and Robinson's Golden Age.