Rating online purchases of fungible items

I bought some plain black shoelaces through eBay, as part of my effort to buy not-Amazon where I easily can. eBay would now like me to take a two-minute survey about my experience. I really don't think I have that much to say: the shoelaces turned up in an envelope, they were entirely as expected, I laced my shoes accordingly. There was no disappointment, surprise or delight at any point. It's rather like when I buy, say, some screws, and a little bag of screws turns up, and it feels a stretch to ascribe superlative excellence to any part of the experience. Any missing stars in a rating is taken as suggesting some problem, which leaves no room for giving extra credit for those times when a purchase truly exceeds expectations.