No, not at all. I check the card quality by looking at them as I pull them. I go by the card number and then look at the name of the player to confirm it's right. When I get back to my deck. I do a card count to see if that number of cards matches the list and check them again going from the bottom of the list to the top. By card number and name and confirming any variation that may be on the list with the info on the cards page. Each card has now been checked over 5 times and doing this does not take long and you never sent the wrong card or come up short.
Everytime I made a mistake I added another way of checking or changing the way I did something. The last change was taking one time and going up the list. That way you are not in auto-pilot thinking and not doing the same thing twice.
This eliminated all mistakes I've made in the past. Oh and also, don't pull cards when you're tired. You can do it in the morning. One day later is no big thing. :)
Take what you want from this to make you better. I hope something here helps you out.
Rock on!!
What is that behind you!?! Oh, It's me! Looking at the cards you have, That I want. :)