When you consider how often storytellers in and outside of Hollywood tend to conjure up simplistic antagonists -- aliens, drug smugglers, serial killers, vampires, orcs, hostile commie gymnasts from the USSR -- as obstacles for a flawed or uncertain hero to overcome, there's something sweetly sincere about how PEACEFUL WARRIOR sticks to self-improvement. Dan's conflict is with himself, end of story.
That said, the dialogue is often hokey and preachy, the special effects and soundtrack music work a little too hard to tell viewers things they might have figured out on their own, and the film feels long at 120 minutes. On the plus side, Nolte gives a pleasantly low-key performance as the curmudgeonly Socrates; a lot of his Obi-Wan/Yoda/Master Splinter stuff is pleasantly unpredictable. Will watching Peaceful Warrior make you a better person? That's hard to say, Grasshopper. But it probably won't make anyone worse, and that's something of an achievement.