Hoagland makes overreaching claims from scant evidence, and can get into quite a tizzy about it. However, that does not gainsay that fact that he did predict some of the major components of contemporary crop circles from the cydonian geometry with remarkable detail, which seems very hard to write off to coincidence. Newton was an alchemist and a deviner--should we therefore ignore the laws of gravity?
It doesn't prove there's no wheat in his chaff, but it does show there's a lot of chaff in his wheat.