As it is Philip I and not Philip II, that will mean damn little, I'm afraid. This isn't the era of badass French Kings, it is the era of French Kings who politely clear their throats and ask that their vassals tone it down a bit.
Well, one should not underestimate Philippe I. The man is only fourteen but Philippe II was hardly the first Capetian to consolidate royal power, he was just one of the most effective at it. Philippe I had one of the longest reign of any kings in France and the regency is just about to end. He behaved very aggressively towards his immediate neighbours and took Vermandois nearly immediately, which had been a pain for the counts of Paris/Kings of Franks for nearly a century. He basically said 'screw you' to the Pope and the bishops because he felt like having a new wife. He lived under anathema for ten years and that doesn't seem to have bothered him overmuch. He managed to defeat William the Conqueror and snatch part of the Vexin from Norman lords. He played William's sons masterfully against one another and used the fact that a lot of his lords had left for the First Crusade and needed money to acquire even more land for the royal demesne. Here, he can't play Robert Curthose against William Rufus on account of them being dead, but even that young he should be able to manipulate a lot of players. If anything, Philippe I is the first of the badass Capetian kings, followed by his equally competent son Louis VI. Don't let the nickname 'the Fat' fool you. The weak one was Louis VII and he had a bit in common with the future John Lackland: last son and destined to be a monk (didn't prevent him from torching a church with people in it). He only acceded to the throne because his elder brother died in a truly freakish accident: while riding a horse in Paris, he came across a pig, tripped and died from the fall. So, Philippe I, in addition to the cool name, was not one to cough politely at the feudal lords who had dominated the early Capetians. Must be the infusion of Kievan blood from his mother. So it all comes back to the Norsemen, eventually !