So did System Shock 2, and that's widely considered a classic. It inclusion is more logical in Dead Space 2 because, while the Von Braun from System Shock was an exploration vessel the base on Titan was an off-world colony.
I rather enjoyed Dead Space 2 myself (far more than I did the original game) and am likely to buy the sequel. On the other hand, I have no intention of paying them through their "microtransactions". If this experiment with microtransactions makes the game less playable, then I'll reconsider purchasing the inevitable sequel. But right now I'm more worried about how the drop-in/-out co-op is going to affect the gameplay than some DLC packages.