I must say i've never seen Doumbia play but i don't understand why people are so negative to sign him for the rest of the season. Ok, he's been awful in Italy but before that he's scored shitload of goals in Russia and Switzerland. Even though that's poorer leagues, he clearly knows where the goals are. And he's scored a lot in Europe as well.
From what i can read about him he will also give us another option from what we have today. Quick and run at defenders.