Lucky Star is a laid-back anime, and doesn't go so serious. If you're looking for something that'll make you feel relaxed, and laugh, go for Lucky Star.
This anime has many references from other anime/mangas. Such as "The Melancholy of Haruhi Suzumiya" .
Lucky Star is just your typical 4 girl anime, so if you expect this anime to be "top notch", don't expect it. You can't expect that from any anime.
The story revolves around 4 girls in highschool.
~A anime/manga otaku, a airhead, a normal person who gets agitated easily, and a know-it-all kind rich girl.
This is all I will say about Lucky Star.
:D It's such a good anime.