I’m not a DJ, but I spin in my head

There are, without a doubt, tons of DJ’s in the greater San Francisco area. As with any medium, some are great, some are bad. I got a free CD of Christopher Lobsinger, who is one talented kid (he’s only 17!) and then I’ve been out at clubs in the area, where they usually always have someone spinning.
By no means am I a turntable jockey, but I do write music and have a musical background, which makes for an interesting analysis of some of the spinners. They all seem to fall into three categories. There are the ones that are flat out no good and probably don’t have any musical education. There are the ones that are good and while they may not be the most amazing DJ’s in the world, they either have some musical training or inate gift to feel out the beat. Then there are the people that are just gifted.
Here are a few things I’ve noticed in the not so good ones as time has gone on, which if they addressed, they would probably be much better:
I – Confidence -> While swapping out the back beats that they’re mixing often may be a personal style, to me, it just seems like they have no confidence in what they’re doing. They’ll put on one song, mix in another really quick and drop the one they had on. It seems as if they’re scared to express their musical interest and want to just fly through everything quickly in the hope that people will grasp on to things here and there.
II – Dropping the Beat -> Even if the songs you’re blending have clashing beats, you can’t let the beat drop out altogether. Watch the people in the club when that happens. They stop dancing and they get disinterested and not in a good for the club, drink buying way, more in a this place is lame, I’m leaving kind of way. You have to keep something in the air that keeps the floor bouncing. This is probably one of those things that comes about due to someone who has taught themselves to spin without teaching themselves musical composition.
III – None Moving Music -> It sometimes seems like everyone will only dance if they hear music they recognize. This is true in part, but it’s also true because a lot of the popular music has a danceable beat. But, you don’t have to play current popular music, you need just need to play something with a moving beat. You can leave Nelly off your list, so long as you know how to mix the low end of a Beatles song with anything, even Celine Dion if you felt like it.
IV – Knob Funk -> Twiddling with the balance and fader knobs is a fun gimmick every so often during your set, but doing a ten minute solo on the knobs is only cool if extremely good and can keep the beat moving (and this is very rare) or if you’re just spinning for your other DJ friends who want to push the edge.
Anyways, these are just some casual observations. I might have more some day, or hop out of the peanut gallery and try my hand at what I preach.