I get very annoyed with Geni because people add so much misinformation. Someone I’ve never heard of made me an uncle to my sister’s son. Problem is my sister never had a son. I’m not going to bother trying to fix it because it’s just one of many mistakes others have made with my data. I’m content with full control over my tree at Ancestry, but even then some people make really bad assumptions when they approve the “hints” from other trees. One woman with whom I had a miniscule DNA match was convinced one of my great-grandfathers belonged on her tree, so she added him as a spouse to her grandfather. When I told her to remove the connection she told me not to be so arrogant. (She did remove him.)
We’re all going to meet up with folks that take our good research and spin it to their own ends (the good, the bad, and the ugly), but I’ll keep my peace of mind by having the control I have on Ancestry.