The problem is that for any other band, ITTOD would be a fantastic album - its just that Zeppelin set the bar so freaking high! But to their credit they rarely felt the need to top themselves.
So for me, ITTOD ends up sounding inferior in many ways. I am one of those that loves Hot Dog now, its just brilliant, funny, warm and smiling all the way through. But SBS and IGC I can do without, sorry I just don't 'get' Crawl, and like Tea for One of Presence, it will for me always be a poor comparison to the mighty Since I've Been Loving You. Controversial, but hey that's the way I feel about it.
I did a review of ITTOD that not all of you will like, but hey at least its a starting point for discussion. I wouldn't call it a great album, but I certainly wouldnt say that others who think so are "deluded", its all personal taste. The problem will always be comparisons to their earlier works for those of us weaned on their first four albums.