As some PF followers are aware, last year I have been wondering, against my own preferences, if there was a possibility of using string theory straightforwardly (no AdS/CFT) in the QCD word. Today I have abstracted my comments into sections 3 and 4 of http://lanl.arxiv.org/abs/0710.1526. Basically, I proof that if it were possible to do such implementation in a way that the fermionic side of the superstring is elementary but the bosonic side is QCD, then supersymmetry implies that there are three generations of leptons and quarks, and of them five light quarks and one massive quark (respect to the electroweak scale). Thus string theory could be able to "predict", given the colour times electroweak group as input, the number of generations and the existence of a massive top quark. Moreover, it could seem that the colour group is also fixed to be SU(3). Well, it is the case that a couple weeks ago I was posting a thread with the title "Greene surrenders", referring to the failure of string theory to establish itself as a model of HEP particles. Then it was counter-argued than it was not a failure of string theory because nowadays its goal is to be a theory of quantum gravity. So what about a situation, say hypothetical if not the one of my preprint, where string theory happens to give some information directly (no RG running, no duality) in the electroweak scale? Should it be a triumph of string theory, or should it be a defeat because it is not in the Planck scale anymore? Sort of stalemate?