Shaving your most sensible parts such as the groin can be done with a regular razor though it's a bit tricky and you can easily cut yourself. I've done it in the past a few times but the skin down there is very sensitive so you will most likely get rashes that will swell and itch a lot. For this reason I switched to using hair removal cream for the body and I find it a much smoother experience. If you decide to use cream though, pay attention to which kind of cream you have. There are creams that must be left for 10 minutes or even more on the zone in question for it to fully take effect and there are creams for which 5 minutes is more than enough. If you leave it on too much you will be in a lot of pain, and you might even get chemical burns which can hurt a lot. When using cream there is a fine line between not leaving it on too much and not getting all the hair removed or leaving it on too much and being in a lot of pain so be very carefull with it and read the instructions carefully.
As for the face, I would never apply cream there because it can go wrong quickly. Just immagine that you move your hand a bit and don't notice it and some of the cream gets on to your head, you will have patches of hair that will fall off. I use a normal razor for the face and have no issues with it whatsoever, just get a good foam and you will be okay. Going against hair-growth is the best way of removing even the stubble. If you get rashes after shaving then it's time to look for a new foam, we all have different skin type so what is good for one might not be good for the other, you just have to try untill you find the perfect one for you.

If you use a electric shaver you don't need to worry about cutting yourself. Irritating the skin can happen if you do it too hard but you won't get cut if using a electric shaver. Although it is worth noting that with electric shavers you have to shave constantly as sometimes when your facial hair gets too long it might not cut properly. I cannot speak as far as using razers as I use electric shavers myself, but those are my two sents anyway.

ehh, its easy to do the pubic hair with razor if you know what your doing. takes less time than say, using those creams
and most of those creams smell like shit.

If i tend to fully shave my face, I'd use regular razor with shaving cream.
@33
I use what's called "After Shave" when i'm done shaving my face. It's really good for preventing bacterial effects after clean shaving.

@60
Yes they do. They clean the skin thus preventing bacterial infection up to a significant extent as well.
They also help minor scratches caused by shaving heal quicker as well as preventing the skin from swelling.

Guys, the most serious problem I have when shaving is dealing with sideburns. How do you keep it at a strait line?