Thanks, Tom.
Yes, I forgot about strong stalks. I'd think you also don't want stalks that "blast" (break in two, for no apparent reason). I've had a few daylily seedlings that annoyingly did that. I think I might have seen it a time or two on irises.
I'm not sure how you'd define "ratty looking" foliage on an iris.
With daylilies, faults would be upright non-arching foliage, or too broad/coarse foliage. Foliage color can vary from different shades of green to lovely blue-green. I'm not sure how to figure corresponding faults with the irises, other than the foliage being disease prone.