well its nice that they stay on top of their game. unlike the few in the past.. "cough " mw2 .....
i mean i do some of the glitches and what not but im still glad that they fix and remove them as needed to even the playing field. the unfair advantages are irritating when they are blatantly obvious.
I would personally prefer no hacks/bugs etc. and free content. However, they'll lose quite a bit of money in doing so. I would think it would be no hacks/bugs because you pay for DLC.