My philosophy is if you can't beat them join them. I can't stop other random people from using cheap weapons so I use cheap stuff too and I will admit it. The only people who could sort this game out is infinity ward, but lets face it thats never going to happen, since they already have our money.
The spawn tubes could easily be sorted by putting a timer on the grenade like it has for the minimum range needed for a detonation, say something like if it hasn't exploded after 3 seconds it blows up mid air.
The commando lunge could easily be sorted by getting rid of it and turning the tactical knife into the commando perk, so instead of insane lunge with no fall damage you will get a quicker melee with no fall damage, which IMO is much more balanced.
OMA with danger close is dirty, but the only thing I can think of is to put Juggernaut back in, since there is nothing in the game to counter stopping power or danger close, yes there is blast shield, but it means sacrificing it for another equipment that is actually useful on the odd chance that someone is using a tube. OMA shouldn't be nerf'd just because people use it with danger close since it means everyone else suffers too because of it, for example I also use it on LMG's for a quicker reload and the downside to that is I don't have a secondary weapon to switch to in a close quarters fight, so it balances out.
Then I get a message after the game saying "could not migrate host because this game is a complete and utter bag of ****". Even when everyone is 4 bars with next to no lag it still tries to migrate host after the match for some bizarre reason. 
