It was tons, miles better than Justice League (I can't understand what they're trying to do with that show; the plots are too ridiculously high-powered for me to care about the characters), and I'd also rank it above X-Men: Evolution, even though the feel of each of the two shows is very different. This one was fun and witty, and overall very entertaining to watch.
I'll admit, I love anime, and don't understand why some people dislike certain 'anime conventions' like sweat drops, forehead vein-bulges, split-panel screens, and super-deformed characters. They're great tools for conveying different tones and elements of the story, and I think they fit this show very well.
Sure, it can't hold a candle to the Jackie Chan Adventures, but Teen Titans is still pretty good. Plus, the theme music is adorable.