I think Li is a beautiful name. It is short and simple, yet strong and classy with a variety of pleasant meanings. I think it is completely gender-neutral, as I can easily picture this name on a male and a female. Overall, I think Li is a great name.
Gong Li is a Chinese actress, probably best known to western audiences for her role as Hatsumomo in Memoirs of a Geisha. Widely regarded as one of the best actresses in China, she has starred in three of the four Chinese-language films nominated for the Academy Award for Best International Feature Film.
Some one-syllable, two-letter names have Zen appeal, while others not so much. Not all names translate as well into any particular language and are perfectly fine as given names, but not necessarily when referred to outside the cultural distinction. In Chinese and other languages that use characters rather than letters, the character and pronunciation for the name Li is considered appealing. When used as part of a double name such as Emi-Li, I think the transliteration Li works well. On its own it gets lost and becomes flat and uninteresting. When transliterated as Lee, Leigh or Leagh (all unisex) for males or Lee, Lea, Leie, Leigh, Leagh for females, all pronounced the same (according to English standardised orthography and/or origin of the name), the name has transformed its appeal, now containing linguistic character, without having to lose the intent of its transliterated origin and/or meaning.
I've seen this name used in two different series. In Avatar: The Last Airbender, this is the alias Zuko uses while in the Earth Kingdom. In the anime Darker Than Black, the protagonist Hei uses this (sometimes spelled as Lee) as his civilian persona.
Li can also mean "plum" or "pear" in Chinese - depending on its tone - and can be used to form such names as "Li Hua (flower)", which means "pear blossom."