They are enough professional,for sell a not finish game.....Victoria 2 is not a FPS,the multiplayer is not "important"....for a first patch.....Simply releasing a patch like you said would be VERY unprofessional: "Hey guys, we know is patch is borked for MP but we decided it's good enough anyway!" just doesn't sound right. Better to release what they ave as a beta patch, this way everyone is cool with MP issues.
Before making a multiplayer game, most players want to play solo ....