I went through a period back around the time they did the O2 show that I went absolutely MAD for Led Zeppelin after years of just accepting them as one of the standards of classic rock and a hugely influential band. Mainly it was because, not so much their studio albums, although I did buy all of them, but their bootlegs. I have heard something in the area of 100 Led Zeppelin concerts, and even their sloppiest messes from the 1977 tour are fascinating to listen to. I would spend days just focusing on an individual tour, playing two or three shows in a row and just being amazed over and over when the band was ON and clicking on all cylinders. Sometimes the self-indulgence would get a bit much, like the 1975 North American tour versions of Dazed and Confused that got over 40 minutes long, but there's a lot of magic to be found in Zeppelin concerts. Especially from 1969 to 1973, they were fantastic on stage before Plant finally blew his voice out and Page started getting really sloppy on stage.
tl;dr: studio Zep is great, live Zep was amazing at times but always interesting.