I'm not a big fan of OotP Percy, but I'm hoping he can redeem himself somehow in the last two books. I don't think he will, but I can dream.
I do love Chris Rankin, though. And while I'm not Percy's biggest fan, I am certainly very interested in him and how he'll turn out.
Some essays/discussions about Percy that I've seen lately:
Was Percy's letter to Ron really as obnoxious as it seemed?
Why Percy belongs in Gryffindor. (This one brings up some very good points.)
In Defense of Percy