This is really totally an individual person question. For example, I've had a few really awful blowjobs from guys - probably an equally number of bad ones compared to women. Some of the best I've gotten were from women. So it really is totally person to person. Remember a guy only knows what HE likes, and sometimes he projects that onto another guy even if the receiver doesn't like the same thing. Not all men are the same. Women have to figure out what a guy likes because they don't have a penis. If she's willing to figure out what the guy likes and give it to him, she can do it just fine.