Well I was rewatching the movie recently and wesker was good in extinction and the prologue of afterlife , but then the plot completely destroyed him, his plan his stupid and why the hell did he had a giant plaga in his mouth? Also he need fresh human DNA to contain his infection XD
In retribution he was ok since he also happear for brief moment and I liked the fact that he was going to momentarily Allie whit Alice and the other to fight the common foe... But guess what? retribution ending was completely skypped in the final chapter, I was expecting wesker Alice Jill ada and the other to fight side by side for their life in one last stand and after that Alice and wesker would have fought a last time since Alice say that he would have killed him after, but That didn't happened, the actors that played the other protagonists where not available so they changed the story and wesker was completely rendered stupid and uselles in the final chapter, you can clearly see that Paul ws Anderson rewrite the saga plot as he please, since wesker was originally the main villain and chairman of umbrella in the previous movies but you suddendly discover that it was Isaacs the real villain and chairman of umbrella and the one from exticition was a clone, mmm yeah sure...
There is not even a final fight with wesker in the final chapter, he die like an idiot and he dosent even use his power during the whole film for some reason