My team has yet to receive a card (and certainly not because we're so good in all four meats). IMHO, make prepopulated checkbox cards as others have discussed to make them quick and easy and then make them mandatory regardless of score. You can always include a couple lines for optional comment if the judge wants to go into additional detail. If a judge can't describe why they did or didn't like an entry then they probably shouldn't be judging. If the comment cards are well thought out they could even help judges be better judges without resulting in nothing but 8s.
22.5" OTG, 2 UDS, Mini WSM "Jose Ahumado", Orange Thermapen