That actually happened... in an amalgam universe that was so wrong nobody ever mentioned it and up until now every memory of it was suppressed by collective will of the humanity... you just doomed us all buddy.
Actually, Batman was sometimes very cheerful and easygoing from 1940 to 1986. He didn't become all-angry-all-the-time until DKR/YEAR ONE changed him for the worse.
Honestly, I think Batman's a better character when he's allowed to have emotions other than unjustified rage, arrogance, and hate. His humanity was a huge part of what made him so special, and taking it away from him in the name of making him "grim-n-gritty" was a huge mistake. I find the Batman of the Golden and Bronze Ages to be far more relatable and meaningful than the guy we've had post-1986.
Now Wolverine being overly cheerful? Yeah, that's taking it too far.