Rated 8/10
This is SO much different from the Pink Floyd you know and love as to really make it a different band entirely. It's more of an art experiment than anything else.
Rick Wright and Syd Barret create an otherworldly sound that upends your normal cognitive order, no drugs needed. Their long, extended whirling and chaotic jams are quite unlike anything else, echoing and reverberating in disharmonious miasma. Engilfed by the sound, you suddenly find that you don't know where yopu came from and you have no idea where you're going. Then Barretts' voice and little childlike vocals come in, creating a grounding, a safer place, like coming home to loved ones.
This whole thing is like walking around in a funhouse, you don't know wether the next thing is scary, hilarious, or just plain weird.
But as a prototype Pink FLoyd album, it is a religious artifact. Roger Waters actually plays along, and his bass lines are QUITE good! Nick Mason brings some free playing to the bizarreness of this orchestration with Waters holding down the time. The music succeeds because of the grounding elements. Waters keeping time inside the chaos. Barrett's sing-song melodies and kindly, folksy vocal style while he sinks more and more into madness. Shades of the blues-rock roots all 60s British bands share, forming the basis for the often difficult improvisational sections.
Without going off about the Pan symbolism, Pink Floyd later tames their wilder/improvisation instincts without leaving behind the more creative aspects of composition, in no small part thanks to the addition of GIlmour and Syd Barrett's dismissal. It's interesting that the band survived this period. Like they say, from the ashes...