Lucky Star is my favourite anime, I have seen every episode many times and it doesn't get old. The best thing about it is you can watch any episode you want in any order and it wont mess up the story line at all. (My favourite episode is 6 Fixtures of Summer).
I don't think there are many bad things about Luck Star. The one thing I didn't like was, the manga isn't as funny as the anime. They change topic and scene so fast you can't tell when the day changes in the anime.
The characters are very different from each other. Konata Izumi is a blue haired otaku and loves games, anime, and manga. She doesn't like to study and would rather play. Tsukasa Hiiragi is the younger twin out of her and her sister Kagami Hiiragi, Tsukasa likes to sleep, cook, and text on her mobile phone. She doesn't like horror movies or school work. Kagami Hiiragi is the older twin and studies hard, played shooter games, and reading light novels. Kagami is always in a different class then the rest of her friends and goes to there class everyday to eat lunch with them. Miyuki Takara is a tall, pink haired, cute girl that where glasses due to the fact that she tried reading in the dark when she was younger. Miyuki is a good student, likes to read novels, but doesn't like the dentist at all and is an only child.
Lucky Star is a great anime and I really recommend it.
