I'm struggling to keep up with the SOS argument because your arguments are all over the place.
These guys are good gears players, I agree with this video about the gnasher:
http://www.youtube.com/watch?v=wY6VCHZxhO8
Yes it takes skill, you can have a player who doesn't know what he's doing and someone who is awesome with it. I'm not saying it doesn't take skill.
But you also get shots which you think should have killed but didn't register. Rule number one in the video, its basic common Gears of War knowledge, the gnasher is not some kind of surgical weapon of death, its a blunt hammer. So everytime you purposely choose the gnasher on gnasher route you're effectively signing a waiver: "Yes I understand and acknowledge that the next few seconds may include some amount of bullshit and I may or may not come out on top".
But we're going off track. That was just me arguing about the "gnasher battles are where the real skill is" - I think the real skill is not signing that waiver whatsoever. Again like the video says top players will use the gnasher as surprise attacks 80% of the time, not as some kind of mano a mano head to head.
But let's backtrack, remember I'm the guy who thinks the game balance is just fine! That means I find all the weapons to be acceptable and useable and you will get people who use each weapon skillfully and unskillfully -
including the SOS.