anyone who doesn't open up there mind and share their desires
I'm not sure it has anything to do with a persons skill but more about the amount of attraction and the desire to make the other person feel good.
Anyone who spends hours telling you what she won't do is a big turn off. I really like turning people on to new experiences and enjoy being taught new things.
1 Poor
2 Disappointing
3 Inconsiderate
4 Inexperienced
If it's 4 then that can be worked on. For the rest, move on.
Jx
some one out to pleasure only them selves.
Someone who only cares about their needs
I would consider all of you not good at sex. Not to say you wouldn't be good in bed. To me they are two different things. I believe in that sexo con ropa. If I'm with a girl I'm sex'n her even when we are out and about. It's about how you hold her hand, talk to her, the way you look at her, things like that. Now I could just put it in and just pound you till the cows come home but it wouldn't be good for me. You may even cum out of your, mind over and over, but to me that isn't the definition of good sex. It might be the definition of being good in bed but isn't the definition of good sex. There has been many times where I haven't came. In fact, the last 5 times I didn't cum because I would really have to put down a pounding. I hardly do much moving, it doesn't take much for her to cum. Ever since I stop coming during sex, I think she is more happy. I can always rub one out when she isn't around. So to all you women bad mouthing guys that don't make you cum, shame on you. If you and that person get along so well and you love being around that person then that's more important. That's what should get your juices flowing--that intercourse between a man and woman. Yup-yup that's what does it for me.
Edit: most of you brought up good points. Parts of the big picture.
Anyone who is fully present, not holding back, enjoying the moment....that's good in bed. Stealing my blanket is not good in bed. Watching the clock or phone.....GET OUT!!
As many others have said, the lack of passion and the presence of selfishness is definitely as sign of bad in bed.
Everyone I have ever been with has been good in bed.
Because it takes two to tango, motherfuckers.
There are some people that can be sexy, but it's like something they put on or take off--fabricated. It impresses you at first. The inconsistency gets tiring quick. Some can love the basic act of sex, only think in terms of their own gratification, but they are not truly sexual--have no passion for it. Their ability to satisfy is always going to be limited. They have tunnel vision when it comes to sex. They are just a dick and just a pussy--both are easily replaced. That gets boring before the initial experience is even over. Someone who is lost in their own stereotype, not comfortable with who they are, unable to truly reveal who they are and therefore unable to explore.
for me, not good in bed, is someone that is only interested in their own pleasure
Unenthusiastic or selfish
I'm no good in bed.
But I'm passable on the floor, and I have my moments bent over a table.
Well I use to think she was a non-involved dead fish. Why isn't she putting in the effort? Then I read this book a friend gave me about how to be a better lover. I suddenly realized she was acting tired and non-interested because she was.. Tired. She was working, taking care of our son, cooking, cleaning, and paying the bills. No wonder she wasn't enthusiastic.
So I discovered that preparing your lover meant more than rubbing her tit. I started helping more around the house, discovering I not only could cook but loved it. Bought her gifts for... No apparent reason. Took a community college class in massage. A miracle happened. My dead fish changed into a tiger shark.
Point is that there are two people involved. You might look inward.
honeydipped. 
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