How much faith can I put in One World Tree sources?

I ask this because tonight I found out that my wife's family tree dates all the way back to the BC-to-AD switch and beyond. I went back to the yellow legal pad her father scribbled some information on and found her great-grandmother was a Tuggle. When I started doing some research on that family I quickly found myself going down a long winding path back to London, then Denmark and eventually Ancient Troy and Jesus era Jerusalem. I found all kinds of "Princess of the Vandals" and Olaf "The Mighty" along the way as well.

The thing that initially struck me as odd was that the further I went, the more trees were linked to these names. At certain points I had over 300 trees linking to the same data. I understand that the further up the tree I go the more people are likely to converge and cite the same sources. But this is ridiculous.

How do you use this resource? Is it worthwhile? Should I flag it as 'questionable'?