Not all.

Lisp doesn't claim to be better (it is often argued that it's worse). But what Lisp does right, it's meta programming, therefore letting the plain programmer improve the language himself.

So while as you suggest, all programming language will have warts and stumbling blocks, possibly deal breaker problems, that you can't do anything about, in Lisp, you can always and usually very easily overcome them yourself, with a little meta programming.

Lisp is not the best programming language, but what you make of lisp is the best programming language for you and your domain.

What if the "deal breaker problem" is all of the parentheses? ;)

No one who seriously gives Lisp a chance ends up disliking it because of the parens. It's about as reasonable as disliking C/C++ because of semi-colons. It's a superficial thing to criticize because you obviously haven't actually given the language a shot.

Given all the weird syntax people put up with in other languages I don't really get the complaint.