I'm pretty sure life would be different if I had a twin. IDK if I would necessarily want one though... hmm. I already have a non-twin sibling anyways. *shrugs*
His... 'unique-ness' probably is part of it, yes. And bland characters always fall flat.
Colo and XD did have some stuff lacking - lack of actual routes and hence wild Pokemon (it makes sense given the context and all, but still would be neat ot see it. XD had wild Pokemon, but not in the greatest of ways...), Colo had a lack of save function that could be used anywhere (fixed in XD however), and so forth - but all games have pros and cons, really.
Over here it's the beginning of spring. (But when it is actually released here it'd probably be autumn). I kinda like Spring the best, myself... And the release dates probably will be similar, methinks.