Some reviews say this episode means more when you watch the 4th season... Perhaps. In the context of season 1 however, it plays like a fever dream and is more than a little self-indulgent. If an episode only makes sense when you've seen 3 more seasons, then it's clearly too early to watch it in season 1.
Some viewers may like the detour down the rabbit hole, however this early on in the shows run, I felt like this was filler. To maintain momentum, after the first 10 minutes of this episode you can easily skip to the next episode. An episode that potentially wastes your time, that you can skip over so easily just can't be rated 10.
Maybe it's worth coming back to this episode much later in the show's run, but most viewers can easily skip this and not feel like they've missed anything substantial to the plot - which is why I consider it filler.
Some viewers may like the detour down the rabbit hole, however this early on in the shows run, I felt like this was filler. To maintain momentum, after the first 10 minutes of this episode you can easily skip to the next episode. An episode that potentially wastes your time, that you can skip over so easily just can't be rated 10.
Maybe it's worth coming back to this episode much later in the show's run, but most viewers can easily skip this and not feel like they've missed anything substantial to the plot - which is why I consider it filler.