The algorithm is open ... however it was produced by a politically motivated rogue government branch that seems to harbouring a cynical bunch of criminal bastards ... do your own due diligence, if you don't have to deal with them why bother?
Compare that to the EC RNG which was recommended by the NSA. A single cryptographer found the flaw in the span of a few months despite it being rather than rare algorithm with no widespread usage. However the entire world community can't find a backdoor/flaw in an one of the most widely used hashing algorithms in the world?
Edit: oops, forgot to point out that the NSA algos flaws/backdoors will be tailored towards cracking by hardware capabilities that they , and maybe only them, possess. So saying it is secure because no-one else has found a flaw is redundant since no-one else knows or can replicate what they are capable of in terms of mining the exploit ...