I used to love me some Thundarr, and I liked Gargoyles initially but did not like where it went... as too favorites, just so many, so I will break them into old and newer:
Classic Cartoon Favorites: Tom and Jerry (MGM not Filmation), Woody Woodpecker, Heckle and Jeckyl, Deputy Dog, Bullwinkle, Courageous Cat, Go-Go Gophers, Klondike Kat, Various Warner Bros (especially classic Taz and Marvin stuff)
Older Cartoon Favorites: Thundarr, Johnny Quest, Scooby Doo (pre-scrappy), Battle of the Planets, Starblazers, Transformers, Robotix, Inhumanoids, Flash Gordon, Bionic Six, Real Ghostbusters, Galaxy Rangers, Space Stars, Danger Mouse, Robotech, Dungeons & Dragons, Superfriends (yeah... I used to love them when I was young, especially Challenge of the Superfriends), Wheeled Warriors
More Modern Cartoon Favorites: (yes I still watch cartoons) Superman the Animated Series, Batman the Animated Series, Justice League (including Unlimited), Young Justice, Futurama, Invader Zim, Venture Brothers, Two Stupid Dogs, Angry Beavers, Brickleberry, Roughnecks, War Planets (aka Shadow Raiders), Reboot, Wolverine and the Xmen
For sanity's sake, I will not count Anime among cartoons except those seriously re-edited and repackaged for American Audiences long ago as I have already listed. Even so, I am sure I am forgetting some.