No I'm talking about how the Doctors behaved post-Time War. Eccleston was damn near "proud" that he made it (the Moment) happen - his words from 'Dalek' - and Tennant wasn't far behind.
Smith on the other hand never really battered an eyelid about it (though with good reason, they rightly so shouldn't mention the Time War by then) but when he finally comes to face the Time War in The Name of the Doctor, it's shoved onto a hidden incarnation. All of a sudden it removes Smith's Doctor from the Time War in a way that made Eccleston's shell-shocked war torn incarnation so powerful.
But that's exactly the point. "The one who regrets and the one who forgets." The Doctor in his first two post-war incarnations (Eccleston and Tennant) was racked with guilt over his actions, but Smith's incarnation chose denial and avoidance, divorcing himself from that part of his history. The whole point is that his approach was different from that of his predecessors. It's not a continuity error, it's characterization.
But when did he visit the Titanic in Southampton? Or Krakatoa? Or Dallas in 1963? Do we just assume they are off-screen adventures he took with Rose during his only season?
I've never understood why everyone takes "new Doctor" so literally, as if he'd regenerated 30 minutes earlier. It just means that he hasn't been around for months or years, that he's still adjusting and finding himself.
Personally I think the mirror scene should've been dropped. He'd been running around chasing the Nestene for a bit after the war; you'd think he'd seen a mirror prior to that day.
But maybe didn't have the chance to stop and, err, reflect on it. And it didn't have to be literally the first time he'd seen his reflection. Sometimes when I get a new haircut or new frames for my glasses or something, I may react to my reflection with surprise or contemplation for days thereafter. It can take time to get used to a new appearance.
It's always been a source of speculation, if Moffat wasn't interested in it then why not leave it for someone else to tackle? Why did he feel he needed to handle it in a slapdash manner?
Because writing a story is not about making only one black-and-white decision. As I said, the "Journey's End" regeneration and the need to introduce the War Doctor, plus the need to give Smith a sendoff and resolve all his story arcs, created the situation, so he chose to deal with it. But it wasn't the single overriding reason he told this story or the ones before it.
This is how stories often happen. Different elements and circumstances come together to create needs or opportunities, ones that you didn't necessarily intend from the start, but that you deal with because they fit the needs of the story or are better than what you originally planned.