I played some campaign level before (original soviet campaign). I think its very great!!! I will play it just once. But all missions. Because multiplayer is priority for me. But I think campaign is really great. All this drama+gameplay+hollywood.
I personally think that soviet campaign is really boring and dull.
What made me buy that game was the USA campaign of Coh1. I remember I downloaded a pirate copy of the game and I tested it by playing the campaign, I got amazed (specially the mission in where you had to deffend a city from german waves and you had 5-10 minutes to get ready before the invasion). That made me buy the full game and expansions, and after that, continue with Coh2 franchise.