The song,the animation,and the endurance of watching it time to time. Intro 10.Azumanga Daioh 9.Elfen Lied 8.Ginga Densetsu Weed 7.Gensoumaden Saiyuki 6.Neon Genesis Evangelion 5.Haruhi Suzumiya no Yuutsu 4.Ginga Nagareboshi Gin 3.Law of Ueki 2.Lucky Star 1.Magic Knight Rayearth (Season 1)
check these out and you'll know that you werer wrong. 1. Trinity Blood. 2. Wolfs Rain / Ergo Proxy 3. Air gear / Darker than Black but mostly chosen because of the songs. as for the endings I'd say Gungrave
Rolling Star Yui is pretty cool also that ending from Bleach with Kon and the other 3 modsouls in dolls. Stotas stots ta tuu ahh ee. Something like that. That song makes me happy ;D
1. Card Captor Sakura season 1 (catch you catch me) and season 2 (Tobira wo Akete) intro 2. The Melancholy of Haruhi Suzumiya intro 3. Mahoromatic season 1 intro 4. Pretear intro 5. Ah Megami-sama season 1 intro that is my top best opening