That is like saying that live action movies are awful because you saw Gigli and Matrix 3.
Come back when you see Grave of the Fireflies, Ghost in the Shell, Cowboy Bebop, etc.
-edit-
I dare you to watch Grave of the Fireflies and not even end up with watered eyes.
If you are interested - it is the story of an orphaned boy and his 3 year old sister surviving in Japan during the WWII firestorm bombings. And it is a very accurate depiction, much more harsh and cruel than has ever been portrayed on live action film.
Ghost in the Shell is the most breathtaking cyberpunk/sci-fi piece of cinema ever put on film, period. It has been praised and imiatated by almost every live action sci fi director in Hollywood. UCLA, Columbia and Yale are known to present this film every semester to their philosphy students. Thats how deep it is.
Cowboy Bebop is a film noir 25 episode series of bounty hunters with the most kickass jazz music score you can imagine, and a plot that is only surpassed by Band of Brothers in my opinion.
None of these animes are the run of the mill CRAP like DBZ, Yugiyoh, and other studmuffinottry that is subjected to kids by Fox. In fact, I wouldnt recomend any kid watch the movies I mentioned. They are NOT cartoons.
Some would also recomend Akira, and consider it the best anime ever made, but I disagree and I think its stupid.