This is certainly just my own but:
1) I never met a 1/72 figure that I actually *liked*. This seems to be the opinion of many others I've met.
2) I've heard that trying to paint detailed facial features on this scale is largely an erroneous strategy since at that scale such details come out as highly exagerated, or aren't visible altogether given the scales involved.
3) The above said, just give 'em a shot and have a good time with them. It might be a good chance to try experiemental techniques and become comfortable with them before committing to them on a more expensive model.
Yeah I've never really found the *perfect* 1/72 figure. I prefer prieser and caeser figures though, or I just sculpt my own (see my 1/72 fast roping diorama). I've had trouble with paint sticking to revell figures, so I wash them in soap and warm water and keep them on reverse action tweezers while I paint them.
I paint 1/72 faces with a mixture of (vallejo acrylics) sunny skintone and brown sand for the base caucasian tones. Then I usually give them a wash of some sort of brown. I don't paint the eyes. Probably not the best technique, but hey, it works for me.
Here's an example of some revell figures on a IBC root beer cap...
and a close up: