Why would you make us pay for a section of a disc we already paid for?
We can make a game with multiplayer, promise dlc, but ship the dlc on the disc and make all the fans have to pay for a part of a game they already paid for.
Now I do like most of the gun upgrades you get, thats not the problem, nor is the more masks, characters, and trials..it's the fact that it was already on the disc. No game company has the right to charge us for something hidden on a disc, i find this just so corrupt, and something should be done about it.
So here's the verdict:
If you really love the multiplayer, and have some money, go ahead and pay for the dlc it'll give you an advantage.
If you are just ok with the multiplayer, play it occasionally, don't buy it. You can still play with everyone who has it, just remember you may have a harder time killing people who have the better upgrades..