We've never had any experiences that turned us off from swinging, but we have had experiences with people that without at doubt left us thinking "Well, that didn't turn out like we had hoped. We won't be coming back for seconds with them." I think this is because we got lucky and our first couple swapping experiences were all with people we really clicked with and the not so good ones came later, so we already had a taste of what it should be like.
My advice it so keep plugging along, be selective, and you'll find a couple that you really click with and it will be all you thought it should be and much more.
Mr. WS