I'm not a missile specialist but I guess the real life V2 ones were weack because Germany was being destroyed by British-American Raids and their Industrial Capacity wasn't able to build lots of V2, and they couldn't be intercepted. The flying bomb V1 was very easy to intercept. By the way the tech needed was very new, so I agree they must be nerfed since they can be researched and built very fast with small costs.
A mão que afaga é a mesma que apedreja.