Da'wah organizations can coordinate between themselves in various aspects or phases of the work. Doing something which another organization has not done for one reason or another is complementation. Constructive criticism is when you offer better alternatives and preferably your services to go with it. If you are not able to offer alternatives but criticize others' work it is destructive criticism which should be avoided at all costs. If you can not offer better alternative it is possible that the one who is being criticized has not been able to find a better alternative either and is doing the best he can.
Condemnation is very poisonous to every society.
Condemnation means you are attacking some one's intentions which only Allah knows. Condemnation causes many personal and social problems. However some competitions could become wasteful and may cause problems. All Muslims should be watchful and perceptive enough to detect harmful and wasteful competition and avoid it. One must obtain a copy of the laws governing such organizations and follow the procedures.