If you haven't heard a title yet then they made the top ten.
20. Idolm@ster
There isn't a single character I remember from this anime. That's not how Idol shows work.
19. Maze the Megaburst Space
Has everything terrible about 90s anime, creepy romance, creepy fan service and horribly incompetent character design.
18. Cutey Honey Universe
The worst reboot ever!
17. Virgin Fleet
I've never seen an anime have so much hatred for both genders.
16. Princess Nine
You had one job! Build a girls team to beat the boys and you failed! Don't care if it's a spoiler I've just saved you from a terrible series.
15. Jungle De Ikou
Wash your hands in alcohol hand gel now light them on fire, it's the only way your hands will be clean after watching this.
14. Spiral Suiri no Kizuna
What I consider the worst anime of the 00s, a very incompetent mystery plot that pulls the most insulting of plot twists.
13. Junk Boy
A series with very poor taste in sex jokes, avoid like the STD you might get watching this.
12. Sister Princess
Patient zero of the creepy sister fetish.
11. Pupa
This didn't come from a normal place, this can only come from a mental asylum from the depths of the darkest corners of hell.