The Bakshi episodes (Seasons 2+3) have a grimy and surreal atmosphere
When I was a kid, I preferred the Season 1 episodes and I hated the repetitive swinging that was used and over-abused in Seasons 2+3
But nowadays, when I watch this show on DVD, I always find myself preferring the Bakshi era of this series. There is a weird, psychedelic and otherworldly quality to them. The colors are definitely darker.
My absolute favorite episodes are "Cold Storage" and "Revolt in the Fifth Dimension". Yeah, the latter is just ripped off from Rocket Robin Hood, but I actually prefer the Spider-Man version. And in "Cold Storage", we are left wondering if Spider-Man actually time traveled to a far flung dystopic New York City or if he just had a near-death hallucination as he nearly froze to death.
I find the constant swinging to be a bit mesmerizing, and the musical interlude is pretty cool as well.