I love how my fellow Pats fans are blasting this guy so much. I urge everyone to take off the rose-colored glasses (don't think that doesn't include you too, feelthepain) and look at this objectively.
Though I don't think that we will miss him as much as people think, the fact is that he WAS a really important part of our Super Bowl run so far. If both Gostkowski and Gramatica struggle (which I believe most Pats fans, including myself, see as an unlikely possibility), we WILL miss him. We will probably miss him a little even if one of the two aforementioned kickers plays well. It has not been frequent that rookie kickers have played well immediately in the NFL, so despite all of the good vibes, I still have my doubts.
As others have stated, the kicker only comes on the field four or five times a game. However, these four or five times are all EXTREMELY important as they either determine the field position for the opposing team*, or earn us between one and three points. If a kicker cannot perform well in this setting, the team itself will not perform well in this setting. Missed field goals resulted in many of the Cowboys' losses last year, and if this scenario occurs here, however unlikely, we will struggle in the same way that they did.
*I realize that other players on the field are also important, but the kicker's placement of the ball is an extremely key role.