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Like someone else said, C4 is a rusher's tool, rewarding attacking the objectives and getting up close. For me that makes it less irritating than camper tools like claymores. It's also a great way to get campers hanging out in elevated windows.
As you can't throw C4 anywhere near as far as nades, plus you have to stay alive after deploying in order to detonate (even if just a second or so), I think this sort of balances out the need to cook frags or the smaller blast radius of semtex.