What makes it different is that syntactic constructs are also expressed with the same syntax and there is no special syntax, so control flow constructs use a syntax similar to function calls.
This is particularly exuberant in Arc where what in many languages would be:
if (<cond1>) {
<then expr1>
} else if (<cond2>) {
<then expr2>
} else if (<cond3>) {
<then expr3>
} else {
<else expr>
}
Note the complete lack of syntax beyond a keyword having 7 arguments in order, which many find nonconsecutive to reading, and also error prone as accidentally making a typo can completely change the meaning of the program.
It is thus that most Lisps have somewhat more redundant syntax:
Personally, I wouldn't mind that a mandatory `->` be required in between the conditions and the expression to further guard against accidental typos. I find that redundancy in syntax guards against accidental mistakes, though I have nothing against the parentheses and in fact favor them.
Clojure specifically doesn't have the bracket wrapper around condition-expression pairs but syntax highlighting/ formatting considers it and aligns stuff nicely. I don't think, it is a problem that it basically is a list or function call with arguments. I do think, adding `->` just like that would be a problem because it would be very inconsistent with the syntax of Clojure.