This is one of the best examples of "strictly better" I can think of:
Plague Rats
Only counts other Plague Rats

Pack Rat
Counts all rats
Can even make duplicates

I reserve the 0.5 for the cards are are really legendary in awfulness, like Wood Elemental or Sorrow's Path... cards that your opponent would actually want to make you play if he could. This isn't that level of awfulness. But it has to be one of the worst 1.0 cards.