The fearless nerf hits orks VERY hard it seems.
Someone borrowed my orks today to use in a game, and I saw mobs of 30 orks making it into combat (yay for run!) only to be flattened completely by a handful of men. It was very very bloody.
Orks, dispite killing saaay, 5ish men, were taking erm... 15 casualties back (I'm making up numbers to be vague so I can avoid throwing rules in) and then being almost entirely wiped out due to fearless, and losing next turn, or running.
Its rather devastating.
That said, running dreadies with 4 CCW is hella fun.