I know Stuart Kendig has mentioned that whites often have poor foliage issues. In our quest for whiter dayliies and breeding white in some of the newer forms, we have to be cognizant that ultimately we want good garden plants, not just pretty faces.
As to the general issue of good garden plants, there are no rating systems for that although garden judges are supposed to note it.
Unfortunately, when we look at sites that sell plants, we see only the beautiful face - at its photogenic best - and rarely see what it looks like in a clump. We don't see the flower when it hangs on opening, when it doesn't double and the single flower looks kind of blah, or when there are so many buds open they crush each other and make deadheading a headache.
We never get a look at the plant when it is out of bloom unless we see it in someone's garden. Daylilies can start looking kind of ratty after bloom season when the old foliage dries out and turns brown. That look can turn off folks who may be contemplating starting a daylily garden.
