So if football was a 2 game season and someone had one bad game, you can't call one game a slump because it meets your half-the-season threshold? You've got to face the facts that slumps can be long or short. It's still a slump. A problem is consistent. Football is a short season so a slump in football will likely last longer (games wise) than most sports.
As for Crosby, I crunched and presented his stats in the thread we had during the season. I've added league-wide stats from 2012 to give Crosby some perspective. For Crosby's career stats below, I am not yet including his 2012 stats so that you can compare and contrast last season. The total career stats are at the bottom:
Crosby Career Stats (2007-2011)
100%__0-19 yards__4 for 4
95.2%__20-29 yards__40 for 42
86.5%__30-39 yards__45 for 52
69.0%__40-49 yards__29 for 42
50.0%__50+ yards__12 for 24
League-wide 2012 Stats (top 30 place kickers)
100%__0-19 yards__15 for 15
96.6%__20-29 yards__198 for 205
89.7%__30-39 yards__252 for 281
80.3%__40-49 yards__233 for 290
62.2%__50+ yards__89 for 143
Crosby 2012 Stats
n/a%__0-19 yards__0 for 0
100%__20-29 yards__4 for 4
71.4%__30-39 yards__5 for 7
70.0%__40-49 yards__7 for 10
12.5%__50+ yards__1 for 8
Crosby Total Career Stats (2007-2012)
100%__0-19 yards__4 for 4
95.7%__20-29 yards__44 for 46
84.7%__30-39 yards__50 for 59
69.2%__40-49 yards__36 for 52
40.6%__50+ yards__13 for 32
So what appears from these stats are that Crosby was 10% below average at 40-49 yards and 8% below average on 50+yards. His 2012 numbers were marginal from 30-39 yards and terrible from 50+ yards. I still contend that MM was a fool for making Crosby kick 50+ yards eight times last year, which is well above his average for attempts.
Green Bay was one of only four teams (NE, DEN, NO) that had 50 or more PATs, meaning that these are elite offenses. In that light, one would think that the Packers shouldn't need a big leg to score points. In 2012, teams average 4.8 FG attempts from 50+ yards. Green Bay was one of six teams (STL, TB, HOU, OAK, MN) to attempt eight or more from 50+.
Our offense needs to be a little better at getting within Crosby's range while he's on the team. I'm all for bringing in more competition and replacing Crosby if a better option presents itself. However, he's not terrible and has gotten the job done when needed in the playoffs. Let's hope that a league-leading place kicker falls out of the sky for us.