I think PDL is okay for a starting point (for some, maybe not all), but it doesn't go very deep.
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I disagree about that. Even just the part you quoted will take someone about as deep as they want to go in Jesus. The truths Rick expounds on and structures in a very motivating way are sound Biblical truths. As such, they have layers upon layers of depth that Holy Spirit can keep plumbing the rest of a person's life.
Sure, anything can be responded to in a fad, shallow way--even Scripture as we see in thousands of churches every Sunday.
I simply meant that PDL is not the best source to go deeper. That's all.