While far from being "scientific", the deer contest results on this site to date are a bit interesting.

One week into general firearms season, 44 participants have reported 5 buck harvests (11% success). Last year at this time 45 participants had recorded 14 buck harvests (31% success).

Seeing a significant drop of success photos on the Indiana forum of Bowsite compared to last year as well.

Probably just the weather...the crops...the moon...people too busy to hunt...people being more selective...etc...