I'm impressed and disappointed in Greninja (I chose Chespin though). A lot of people made it out to be a strong attacker (I'm combining both Physical and Special). While 95/103 is nothing to joke about, it's not that crazy good. Basically it's Speed is what gives it the edge
95/103 is not bad, the latter's just below Infernape's Spatk for instance. Stiil, Greninja's bread and butter will be Protean, a ability that gives him STAB on any move it has as well as provide some defensive flexibility, it gives him the best advantage with his stats. Unfortunately like the other two starters GF decided it to be best to give it a lackluster movepool outside of certain moves so while it gets enough to abuse, it's not as much as it could've. I think it's definitely going to hit UU, maybe OU if something tips in its favor with egg moves or the new metagame.