I think that some of you are oblivious to the fact that U2 consists of artists and that art is a form of self-expression.
So, I couldn't care less about how and if they change their sound. I care about the result of it being true, real, a form of self-expression.
During the AB, Zooropa, POP-stages, U2 were more bitter, harder, cynicial on MANY different levels; faith, love, the super-stardom, you name it. They were expressing that. Some fans loved it, others didn't.
Then they took a break, came out with ATYCLB, back to the core, simpler structures, more positive lyrics (allthough there are exceptions there).
Next up, HTDAAB : imo, it's NOT a sequal to ATYCLB, it's deeper, something else, something entirely different. It has different topics, is harder in sound (Love & Peace or else!!) etc...
Remember, these guys have kids now, they reflect on their lives, their marriages, their loved ones, the world, their Faith, etc.
Who on earth are WE to demand how they should sound like?
I want to hear U2 expressing themselves, whichever form it takes. I will not like each album equally, of course, but I dont mind. I try to understand where they're coming from and appreciate the songs starting from there.