I have seen many post on this forum complaining about this particular explosive being too powerful and needing a nerf. So, I thought I would put together a short guide on how to deal with them. First of all, IED are not over powered. They cost one of your 12 slot points to have one and 3 slot points to have 2. Also, unlike Black ops 2 there is no way to restore them, so if an opponent is willing to spend 25% of their class I don't see a problem with a piece of equipment getting them up to two kills for it. The reason people hate them so much is that they will end an assult or specialist kill streak and they are a one hit kill. If you really care about your streak that much you should take some precautions.
If you are at full health with Blast sheild, you will survive an IED even if you are standing dead center on it when it goes off and it's user has danger close equipped. The perk is a very economic solution to the problem at 6 squad points and 2 perk points. The problem is that not may players use explosives in ghost and most players would rather have other perks, so the benifit isn't as tangable as in other COD games. If you are running specialist, Blast shield should be the first perk you unlock in your streak. Sit rep offers another counter, but it too has a similar cost with less than ideal benifits.
I know many players don't like to run these perks, but it is possible to deal with IED's without them. Once you know another player is running IED's on a map you need to adjust your play style a little. Do not sprint in any area where you think there might be one. Just walk normally, when you trigger an enemy IED, it beeps 3 times before it blows up about 1 second later. When you hear the first beep, you need to IMMEDIATELY push your left stick in the exact opposite direction you were moving. If you are fast enough, not sprinting and at full health this will get you out of the blast radius far enough for you to live through the detonation. This technique requires quick reflexes on the conroller and takes some time to master. Load up a private offline game and put in about half an hour of practice and you should get the hang of it.
Note, that after you take the blast however, you will be wounded to the point that one bullet from any weapon will finish you off. So you need to retreat and heal or you are going to die anyways. However, this offers you a counter to this piece of equipment that doesn't need any perks to do it.