Sorry jamminwolf but I don't agree, I use both of DT's injection products and like them both. The first product (the one with settings for M4) does require some tweaking, the ambient does need altering or turning off the other setting that can need lowering is the susurface strength and the subsurface group.

You need to check that there are specular maps being used if the texture has them they can sometimes be removed by Injection depending on where they are placed, if this has happened put the, back. If the character has no soec maaps use ones from another M4 texture set. the

First render, Morris' Lazarus texture, inj medium, no tweaking.

Second render, same texture and lights, ambient turned off, Subsurface strength 70%, subsurface group 3.

Lights used 1 distant light raytraced shadows, and 1 uber light.