As I recall, the movie got a lot of buzz on first release. After all, 1965 was decades into Hollywood's fixation on the commercially conventional, with linear narratives, explicit story lines, and happy endings with no loose threads. In short, just the kind of traditional story-telling that sent audiences home happy, reassured, and ready for more. So it's not surprising that many folks, of perhaps a more imaginative bent, were ready for something different. After all, art-house theatres were taking off with the likes of Ingmar Bergmann and the French New Wave. So along comes a movie like Mickey One with a very different Hollywood slant, and, by golly, it gets talked about, maybe more than it should have.
Seeing the concoction today, it strikes me as mainly a mess, perhaps more self-indulgent than honorable, but a mess in either case. Of course, it's harder to specify standards to judge arty films by than it is conventional films. After all, a critic's misgiving may amount more to critical oversight than to an absence of subtle profundity. I'll take that risk in saying that whatever the symbolism of Mickey's predicament, it's hard to care. And that's mainly because whatever the intended symbolism, it's too unstructured to invite interpretive inquiry. To me the movie's more a series of occasionally jarring visual effects than anything invitingly profound. It certainly doesn't help that actor Beatty is simply too callow to give Mickey's complex character a persuasive purchase. And since he's in about every scene, we're continually burdened with seeing the actor instead of the character.
Some folks look for an existential reading of whatever subtext there is (my impression is something about mysteries of original sin and freeing oneself from the overhang). So for those interested in existential themes, let me recommend Monte Hellman's 1965 Western, The Shooting. In my book, Hellman shows how a profound subtext can be combined with conventional story-telling, and in a way that may not be flashy, but is at least involving. All in all, it's no mystery to me why Mickey One, Two. or whatever has since drifted into obscurity, and in all likelihood, will stay there.
