Lua can be great. I've worked with it extensively on a personal project, where I've embedded it in a C++ app. However, there are some things that you will hate:

  * Trying to correctly do "inheritance"
  * Having to write all of your batteries for common ops
  * Array indices begin at 1!
  * Poor debugging support

Aside from those thing, Lua is great. It's crazy fast and easy to embed.