I lol'd at this. A thing is either custom or it isn't. This isn't quite as bad as if you'd said YC were 'very unique' -- a thing is either the only one of its kind or it isn't -- but you might investigate getting someone with a solid English background involved in your PR (and Mike doesn't count, because there's no comma between "solid" and "English").
But I can't affirm strongly enough that a bad -- or even unfamiliar -- aesthetic is extremely detrimental to one's perception of a site. I recognize it's superficial and not nearly as relevant as making sure the bugs are fixed (of which I've experienced at least two), but it screams at one more persistently even than do bugs, if less caustically. All I can say is that I hope Hilary et al work quickly, because I don't much care for this new design at all. And the banner is an absolute trainwreck.
Again, I'm fully aware of your position, and understand the migraine this transition must be for you. And I respect you for your desire to improve YC.
Finally, I'm slightly irritated by the change in coding for quoting someone. Instead of [ quote = yo momma ] and [ / quote ], we have to type twice as many characters, and make sure the apostrophes are all properly placed, and so on. It's not a huge deal, but it's a changing of habit, and if you/mike could find a way to get the old, simple code back and impose it on the quoting-action, I would be very much grateful.