Hi Carlos, welcome to Capcom Europe.
I felt the same way when I got my hands on the game. It is a great game, no denying that, but a splitscreen option would have doubled the fun.
My COD-fanboy friends can't help but evaluate the game as if it were a Call of Duty spin-off. The first thing they critisized (aside from the "It's third person, mehmehmeh"-whining, is that the COD games have a two-player splitscreen online mode and a four-player offline.
The problem is, I don't think a splitscreen can be implemented through DLC. I would welcome it with open arms, but I doubt it will come.
But don't let it spoil the fun; if you have the option to play online, go try it out.