Doing the list this way forces you not to consider the best 100 ever, but to make hard choices to include worthy entries that might otherwise not crack such a list.
What caught my eye was the spot-on selection at H and the format break at C to include Cowboy Bebop. The rest of the list looks pretty solid. If I'm going to nitpick, R looks like a miss. The Ren & Stimpy Show never did it for me. Rurouni Kenshin or Robotech probably would've taken that slot on my list.
Actually, going with a separate anime list might have made this a little easier. By including any, they've opened the door the argument several more letters are off -- Muppet Babies vs. Macross?