Maybe it's because it is an active division with numerous fighters in different organizations, but in less than one week 5 of the top ten featherweights as ranked on this site and others have lost fights. I defer to this sites ranking for easy reference link.

UFC 125: Resolution

Nunes defeated Brown via split decision (29-28, 29-28, 28-29)

Poirier defeated Grispi via unanimous decision (30-27, 30-27, 30-27).

Brown was ranked #2 and Grispi ranked #7  was almost a co main event fighter until his opponent the featherweight champ Jose Aldo had to pull out due to injury and Dustin Poirier stepped in.

SRC: Soul To Fight

Hioki defeated Sandro via unanimous decision to become the new SRC Featherweight Champion.

Maeda defeated Kanehara via TKO (Punches) at 1:27 in round 1.

Sandro ranked #4 was looking like the Shane Carwin/George Forman of the division with his recent streak of KO wins and was thoroughly outboxed and outgrappled by Hioki ranked #8. Also on this card had the former Sengoku featherweight champ Kanehara ranked # 10 getting pistol whipped by Yoshihiro  Maeda.

K-1 Dynamite!! 2010

Takaya defeated Fernandes via unanimous decision to become the new DREAM Featherweight Champion.

In their rematch Hiroyuki Takaya ranked #15 was able to best the man who beat him in Dreams featherweight tournament final, former champ Bibiano Fernandes ranked #5.

Most of these defeats came at the hands of other top 25 fighters and some came from guys not even ranked that high. It can be deduced that either this division needs more refinement before we can seriously look at a fighter in the division as an elite competitor. Or half the top 10 guys don't do well on new years weekend.

As much as it pains me to admit this as an ardent Aldo supporter, the featherweight division while very exciting needs to stew a bit before it can attain the luster of more established divisions.