I remember that my PTP forum activity started from the similar topic. That time I was quite sure that everything is allright. Since then I talked with some people about combat shotgun driveby, and I am not that sure anymore...
I can understand the concerns. But, as for me, if we take into account all of the teams options, the gameplay would be more or less even for each team. Skittles is right: we can guarantee that the gameplay is fair only by granting absolutely equal opportunities to absolutely everyone. But we can also balance the game by making sure that each option and strategy has both pros and contras, strong and weak spots. If two terrorists abusing combat shotgun driveby meet at least two cops onfoot, the cops would have a lot of options to counter and fight this combo.
Besides, if it gets disabled, the terrorist class would be too weak. AK47 is way worse than M4, same goes for TEC9 and Uzi. And if you take into consideration that our regulars love to form strong and numerous cop armies... The balance must be changed cardinally then. I don't think we need this because the current one is more or less fair, so -1.