Well, when you start out by hearing names like RVP, Cavani, Higuain, and Suarez, only to end up with Dzeko, then yes, it's a fucking massive disappointment.
Last year we didn't have CL football, so failing to land Aguero was understandable (even though it still hurts like a bitch). However, if we really want to make a statement of intent, prove that we are truly back, we should be aiming higher than "one season wonder at Wolfsburg" Dzeko. He is good, but he can't do it all, and I'd rather a striker who is more agile, nimble, and unpredictable. Dzeko isn't that guy.