Unfortunately, the only way I can think of to express the quality of Human Target is to say that it is hit-and-miss.
Hold your groans - the quality is irrelevant anyway.
All you need to know about the quality of the show is that the lead cast triumvirate of Mark Valley, Chi McBride, and Jackie Earle Haley is excellent (especially the last), the fight choreographer is wildly creative, and all the dressings - props, costumes, sets - are very well done.
But none of that matters.
What is important, is that there is nothing about Human Target that isn't HILARIOUS. I can't tell you what element is most utterly ridiculous - the improbable scenarios, Bear McCreary's hyperbolic score, the excess of familiar faces from sci-fi television (mostly BSG), or the total disregard of the laws of physics - but they are all certainly work some belly-laughs...not because they try to be.
Human Target is based on a DC comic series of the same title. Supposedly there is some sort of actual storyline involved. But honestly, the build-up is so slow and the originality is so minimal that I can't bring myself to expect much of it.
Human Target is not a show for people who want to think hard about what they're watching. As a nonstop thinker, I can tell you that using your brain to watch this show will only cause tremendous pain. But my inner thirteen-year-old boy revels in its James-Bond-Meets-John-McClane-Meets-Every-Action-Movie-Ever enthusiasm. It may not make any sense, and it may be taking itself just a bit too seriously, but it is damn fun.
There are only two honest criticisms that I can make. 1) The opening credits. Whoever designed that sequence should be exiled to Pluto. 2) The stylistic schizophrenia. Every one of the four episodes that has aired so far is completely unique in terms of format, pacing, and general storyline. I prefer some over others, but they are all reasonably effective. And they are completely mismatched.
Yes, there are definitely some MAJOR flaws. Yes, you could spend your time much more productively. And yes, Guerrero does say "dude" entirely too often. My brain tells me that Human Target is moronic and crazy a waste of my time. And yet I CAN'T STOP WATCHING IT.
Overall: I suggest you watch at least an episode. It's hysterical, if nothing else. (Just skip the opening credits.)
(This review also posted on my blog at http://meltedbrain.wordpress.com.)