via Internet Archive:
Slant Magazine says, "The Big Combo is scary, and disturbing, because it never entirely gives over to the kind of outright hysteria that might serve as a catharsis, and so the feelings of cloaked desperation are never expunged." Images Journal has a positive review. DVD Talk says,
The Big Combo is a rewarding thriller with a good handle on the hardboiled crime saga circa 1955. It's especially instructive as an example of a movie with a visual surface that completely hides its low budget origin. Few films so convincingly seem to be Somewhere when they're really taking place in a non-budget Nowhere. Sex, violence, and silhouettes of alienated characters in the fog ... The Big Combo puts the graphic noir back into film noir.Rotten Tomatoes has a critics rating of 92%.