I think she's really cool and adds something different to the books/movies. I think she stands for a really 'out there' personality and shows that you shouldn't be afraid to be different. Unique is good, it's what makes her interesting. :)
She's probably my favorite HP girl, along with a few Slytherins (considering I'm not fond of Ginny at all, and I'm not crazy about hermione or cho terribly either).
I've just found that her quirky and random nature brings a comic relief that no other character does or could do.
Luna is one of my favorite characters in the movies. She is a funny, kind, strange and unique girl. She shows to be your unique self and not care what others think.
I LOVE HOW SHE ACTS BLISSFULLY UNAWARE THAT OTHERS FIND HER ODD. I LOVE HOW SHE NEVER GIVES A SHIT WHAT ANYONE THINKS. I LOVE HOW SHE IS HERSELF ALWAYS AND MAKES NO APOLOGIES FOR IT. SHE SEEMS EXTREMELY SELF-ASSURED AND CONFIDENT IN HER ABILITIES. I ENVY HER PERSONALITY REALLY.
Luna is my favourite HP girl. She is unique and special and dreamy, but she is also a strong personality, she can stand on her own and defend what she believes in. She is a good friend and a loving caring person. She is one of my all time favourite characters.