"Chances are that if you’ve seen a prominent Texas singer-songwriter over the last couple of decades, you’ve also seen the [long-haired] O’Connor, sitting off to one side picking acoustic guitar. I once remarked of another hired gun turned solo that there must come a point where a sideman has to wonder how hard the singer-songwriter deal can be if this yo-yo can do it, and O’Connor reached that point some time ago, releasing Green And Blue (Bare Knuckle) back in 2000. [Bloodshot Vagabond] is his fifth album, counting one he split with Adam Carroll, and I’d say he’s pretty much got a grip on it. Of the 11 songs, three were cowritten with another in demand sideman turned songwriter, Jeff Plankenhorn, and two with Carroll and Michael Waters, which may, or may not, explain the emotional range, from sentimental to stoic to pensive to badass. Produced by Jack Saunders, who also plays upright and electric bass, with the great Rick Richards on drums and percussion, O’Connor, who plays all guitars, lap steel, mandolin and banjo, rather unusually, has no other guests, providing all the instrumental fireworks himself and it's the perfect integration of songs and music that’s the payoff when a sideman successfully makes the transition to frontman, there’s nothing lost in discussion."
- John Conquest, 2016
"...part of the same Lone Star constellation as such Texas legends as Guy Clark, Kris Kristofferson, and the late Doug Sahm and Freddy Fender."
- Richard Skanse, on Michael's induction into the South Texas Music Walk of Fame
"O'Connor may be yet another hidden gem from Texas . . . soulful vocals. . . and his songwriting is top notch."
- Eli Petersen, Twangville
". . . a collection of songs that take unvarnished looks at not-so-beautiful losers who populate the margins: the has-beens, the never-will-bes. . . With the line, 'a bar tab as long as Billy Gibbons' beard', even losers win."
- Jim Beal Jr., San Antonio Express-News