I agree with @GazzaGarratt, holding back content to release it at a later stage just seems like a better way of hiding the lack of new content they have for this game, which is just the same as the previous MW2. They're getting better at vajazzling.
Nonetheless I too am actually enjoying MW3. But then again, I haven't found the 'SBMM' to be much of an issues really — it's probably because of my hyper fixation on the objective to grind the win.