No problem here - I tried it with 4 of my 'Leave Feedback' links & they all loaded in 2-3 secs.
Try it by clicking on this 'generic' feedback link click here - should give you a list of all the feedback you can leave.
"Is there a real problem or am I just being unlucky?" - could be neither...
If you're still unable, I suspect eBay have already got wind of this fraud auction & deleted it off their site. Will also explain why you cannot access the feedback page for this particular auction. And, for the same reason, you may also find it'll fail when you try to load the original auction link from your "You've won..." email.
Whatever the reason, make sure to contact eBay immediately & let them know about this fraud, plus open a dispute to get your money back. All the best with this.
As you know, these days one's entitled to a full refund (including postage) if eBay items are wholly paid for via PayPal click here. One needs to follow the eBay-PayPal link to make payment. Or, I think, one needs to at least input the eBay item number when paying directly at PayPal.