I personally LOVE the morph injection, then again, it doesn't take me nearly as long to inject all morphs as some are reporting.
I have found that P5 seems to forget what it is doing, a simple attempt to change the camera position gets the ball rollin' again.
I absolutely HATED V2's long list of dials, I seldom use her anymore because of this. Yes, you can remove the ones you don't use, and can even add them again, but that is such a pain.
I think the whole disappointment with the inj is more an issue of poorly performing computers and bugs within Poser itself.