No they are Not !!!
played two 600 pt battles last night , "high ground" scenario against a Gondor army with Boromir and an Ent, the other "To the death" against a morannon, black numenorean army led by the dark marshall and 2 morannon captains supported with shelob and two castellans, both were hard fought battles.
My army of orcs were led by gothmog, a orc taskmaster another captain and ably supported by a beast of gorgorath. (9 bowmen for the price of one fig)
in the first battle i used my beast to get the opponents away from the hill even though it suffered 3 wounds we kept far enough away from the Ent to allow more orcs up the hill and whittle away gondor till he broke
in the second battle the beast was slain in second round by a castellan after being transfixed by the dark marshall and hit with a morgul blade aagh !!!, amazingly 7 of the riders survived the fall and dead weight roll and continued to play. i didn't win priority that often but with gothmog and whip of master combination and several sixes saving heroic move points , we soon put castellans, and dark marshall to death, the orcs held their own against the black numenoreans, " loved the dice last night" shelob was pitiful, i kept sending a single brave orc into combat with her, never have had such luck with courage, in the end though at break test time it was i who won again, so no the orcs are not obsolete just have lots of them and a good hero to lead them