About a dozen? The default statement when it comes up is "god I hate it, it's time for a better designed easily-embeddable language". It doesn't have any kind of mechanism for sane organisation of code, I vaguely remember it having bizarre types, arrays start from 1, the syntax is incredibly tedious, the errors are bad, how could I forget global-by-default variables, ... I get that it's easy to embed, but I find it to be a complete pain to work in.

I've probably written Lua for about 15 hours in various contexts, and I've never enjoyed it.

I haven't written in it for a while though.