It's an interesting construction to me. (No joke intended on the "to me" there!)
I'm not sure if there's anything funny or odd about it.
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Hi, Andrew—I don't think there's anything grammatically wrong with that.
"How hard this is" is an extraposed nominal clause functioning as the real subject: How hard this is (This degree of difficulty) is unbelievably disturbing to me.
Hi, Andrew—I agree with Gustavo that there is nothing grammatically wrong with the sentence you have asked about. As Gustavo says, "how hard this is" is an extraposed clause. It's what's known as an extraposed exclamative clause.
Extraposed WH-clauses, including extraposed "how"-clauses, come in two varieties: extraposed interrogatives ("It's hard to know how much this costs") and extraposed exclamatives ("It's outrageous how much this costs").