Raketen does not counter UC. It can maybe stop it going from one point of map but raketen is too slow so he can easily just drive UC elsewhere on the map where your troops are and since you invest in 270MP in raketen you have less troops he can just easily push off troops with UC. Raketen is useless vs UC unless vs terrible player who somehow manages to take two hits (less than 50% chance on each) from raketen on UC.
UC can only be repaired with vet1 ability until sappers, which means that any damage you do is pretty scary. This isn't as big of a deal as it used to be when the UC has a fuel cost, but still pretty big.
Use the raketen to zone out his fuel point area and push with your infantry. You can also put down some early mines to catch him out.
That HMG would be easy one for them 
Dullahan
Strategos
Wall $treet Fat Cat
Street Bit
pensss
Relic Entertainment
