OMG, I just spot-checked WTN for some player records, and their DB is still useless. One of my teammates, who played four matches this fall and received a year-end of rating of 4.0C doesn't even appear in the WTN records. I searched his partners, and his name simply appears as "player" with a very poor WTN rating. His real rating, if one was generated, would certainly be much better.
In other cases, only one of our three-line matches got recorded. Of course, all of the data was recorded correctly and entered immediately into TennisLink. But, WTN failed to upload it, or record it.
So, I did a small spot-check and found several omissions or other problems. I don't know anything about the WTN algo. But, if the data input is garbage the output is garbage (GIGO as they used to say). USTA should be ashamed of themselves. Apparently, no one even checked the accuracy of the WTN DB! They spent millions on marketing a junk product.