There seems to be a lack of recognition of what Kubiak was asking of Bullock during this game. By week 2, Bullock is the only kicker to attempt three kicks of over 50 yards. Here is how he compares to other kickers in the league at this point.
Player: 40-50 yard - 50+ yards
Garrett Hartley: 3/4 - 0/0
Dan Bailey: 1/1 - 2/2
Sebastian Janiko: 1/2 - 0/0
Stephen Gostko: 1/2 - 0/0
Greg Zuerlein: 1/1 - 0/0
Jay Feely: 2/2 - 0/1
Nick Folk: 2/2 - 0/0
Rob Bironas: 2/3 - 0/0
Caleb Sturgis: 2/2 - 1/1
Josh Brown: 1/1 - 0/0
Blair Walsh: 0/0 - 1/1
Alex Henery: 2/3 - 0/0
Nick Novak: 3/3 - 0/0
Billy Cundiff: 0/0 - 1/1
Graham Gano: 0/0 - 0/0
Dan Carpenter: 1/2 - 1/1
Steven Hauschka: 1/1 - 0/0
Phil Dawson : 0/1 - 0/0
Adam Vinatieri: 0/0 - 0/1
Justin Tucker: 0/1 - 0/1
Matt Bryant : 0/0 - 0/0
David Akers: 1/3 - 0/0
Robbie Gould: 0/0 - 1/1
Matt Prater: 2/2 - 0/0
Josh Scobee: 0/0 - 0/0
Rian Lindell: 0/1 - 0/0
Ryan Succop: 1/1 - 0/1
Randy Bullock: 1/2 - 0/3
Mason Crosby: 0/0 - 0/0
Two things should stand out: Dan Bailey is having an incredible season, and Randy Bullock has attempted more 40+ yard field goals than anyone not named Dan Bailey.
Other kickers who have already missed kicks of over 50 yards are Justin Tucker, Adam Vinatieri, and Jay Feely. Other kickers who have missed 40 to 50 yards out are Sebastien Janikowski, Stephen Gostkowski, and David Akers.
Those are veterans. Randy Bullock is on game 2 of his career. If Kubiak wants to set up Bullock for statistical success, he will have him kick from the 25 instead of the 40. But Kubiak obviously wants him to develop into a 50 yard kicker, and he is putting Bullock in tough situations in order to learn.