ITS ALL ABOUT WHERE YOU ARE AND WHEN.Personally i like them all, but u can't like a MP40 in a situation that sniper tries to pick you off, because its hard or impossible to response.Although when you are 5 m behind its..well hilarious.
Although I like all the guns i have few favourites (this was asked ) Thompson, StG44,Shotgun, KAR98k Rifle ( ), KAR98 Sniper, hmm.. BAR and Garand come next.Then the rest are something c*ap in my opinion well Springfield ok but its still worser than its counterpart