I don't really know how to classify a good coach outside winning of trophies. Because outside trophies, we can't deny that Mikel Arteta has obviously transformed this Arsenal team into a force that's been reckoned and feared by other teams in both domestic league and European competitions. I think he Arteta just hasn't yet figured it out just like Pep Guardiola his mentor in winning trophies but am sure with time this trophyless seasons with arsenal under Arteta is going to be a thing of the pass.