I really never see blobs as a viable tactic strategy. I end up facing against players that blob a lot, and all they do is bleed their own MP. Not only that a blob can be out capped. so you'd get more income then the other guy in the end. And on top of that by the time that they get a tank, you have more then enough to deal with the blob and the tank.
Oh and they are really easy to lure into traps.
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