Going with fan service on this one. (Ill rephrase since people are indirectly responding to me) , (what THEY feel is fan service, whilst reusing the asset, in other words, what i think they where going for, not how i portray it)
Or intentional. (Same thing)
Reasoning, I'm pretty sure a game that sells like COD has an enormous community.
Do you think they really would be able to get away with just a rushed ending and not get called out on it ?
Its 2 things, rushed yet they did it in such a way that most of the community wont care.