In 1v1, no. Allies completely dominate semoisky. Unless you can hold a reasonable amount of territory (very hard on this map since it's so hard to hold any points on the sides as Germans) it's going to be a real struggle.
Allied units tend to perform much better at mid and close ranges than German units. And on a map like Semoisky, where buildings and true sight lead to close fighting, allies have a good advantage with their basic infantry and light vehicles. Plus, German units tend to be worse alone (since lower member squads mean more chance RNG screws it over which leads to retreat faster), making it even harder to harass more distant territories.
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