Arnhem is indeed an irritating map, but I wouldn't so much say it is allied favoured as it is infantry favoured. All the cutoffs and buildings are a wet dream for players that build a ton of infantry rather than players who use support weapons and light vehicles.
Americans and Soviets have the easiest time due to their large amount of infantry, but a heavy grenadier/pio playstyle is equally annoying.
I tend to prefer Toad to Kharkov, Crossing in the wood and Kholodny as far as 1v1 is concerned.
Crossing? Hell no.
Road to Kharkov? Hell no. Better go for Minsk then.