Damn straight! Yet they aren't overpowered by any means. Note that I listed at least five common methods with which to nullify them.
I just think it's important to showcase some weaknesses along with the strengths of nations so that a user doesn't get blindsided in a multiplayer game. There's a lot of effort and time that go into them, and I wouldn't want someone to get hurt by following my guide from something I omitted!