That's not bad at all :)  The thing to keep in mind with those V3/M3 type rigs is that you really need to use the buttock bone when posing along with the thigh, if you bend the thigh too much then you'll get a kink like you're seeing.  It's a limitation of Poser's rigging system; the thigh bone can bend the polys in its own group, and its parent group (buttock) but not the hip polys.  The buttock can bend its own polys, and the hip.

My Freebies