So, no-one in favour of making the 3rd movie the weakest one in the series
I wouldn't be surprised if that happens.
Call me a doomsayer; but it is hard to see how they can go anywhere but down after The Dark Knight
. That is a hard act to follow and an even harder act to top. If the next film is merely okay, or just good, it could be slammed as the worst thing ever - and heaven forbid if it's a little bad.
And that Batman voice definitely needs to be dialed down a notch.
The consensus is that the third movie in virtually any superhero franchise (which has gotten that far) is weaker than its predecessors. Superman III, Spider-man 3, X3, Batman Forever, Blade Trinity.
Indeed, nearly all third movies in a trilogy end up being the weakest, from Godfather III, to Return of the Jedi. Only Bourne and Die Hard break the jinx (well, you could also include Revenge of the Sith and some might include Indiana Jones 3).
Unfortunately for Superman and Batman, Supes IV and Batman & Robin were even worse than their predecessors ...