Just give me the power of Lisp and more in a new and interesting way and we'll discuss implementation performance later.
Oh look, operator precedence. Yet another thing prefix notation eliminates me from having to memorize or otherwise puzzle out.
Why do we have to keep doing this over...and over...and over...
Make an LLVM Lisp with S and M expressions and concurrency primitives and you have an interested customer, otherwise, I'll keep hacking in Clojure.
I love seeing new things but I don't understand why people keep making these kinds of languages over and over, we've been doing it since Perl, Python, and Ruby came out.