probably should focus on players but there are some Coach rankings out there.
it is early for O'Brien, generally I like his style.
here is all I could find since season started off the internet
http://sports.yahoo.com/news/ranking...lkA1ZJUDMwMV8x
25. Bill O'Brien, Houston Texans
Very well respected around league circles, O'Brien has already doubled the Texans' win total from a year ago. Probably an upgrade away at QB from skyrocketing up this list.