Anime fans asked which anime they would like to recommend to people who never watch anime supply a list of top candidates.
The ranking (with votes for multiple seasons condensed):
1. Clannad / Clannad – After Story
2. Code Geass
3. Angel Beats!
4. Mahou Shoujo Madoka Magica
5. Natsume’s Book of Friends
7. Hanasaku Iroha
9. Kimi ni Todoke
Why is that Clannad is first, I've had so many people I've tried to convince to start watching anime start with Clannad and it's never worked. I'm pretty sure Code Geass would though. Clannad isn't bad but I personally don't think it's a good starter.