You know, I'm not sure I had ever listened to this album all the way through before. It's for sure a lesser piece of work than Zep IV, and kind of peters out at the end, but... I've had moments of these songs stuck in my head for 12+ hours now after listening and that tells me it's likely an album I will appreciate more on repeat listens. "Out on the Tiles," and "Tangerine" stand out as songs from the catalog I'd never given much attention to before. "Immigrant Song" is a classic for a reason. But I think the real litmus test here is "Since I've Been Loving You." If you can stomach that song then there's probably nothing Zeppelin can throw at you that you won't, at least in some small way, appreciate. For me, this song produced a big sigh at the beginning of it; "another classic rock band just straight up ripping the blues." But it wins me over as it goes along and, in my opinion, becomes something else entirely. It's an experience, that song. I can see what somebody might absolutely loathe it. But I'm a simple man, fellas. I like riffy guitars, loud drums, and screeching vocals. And it's impossible to argue even 50 years later, that this band didn't do that formula better than most.