At least Zeppelin didn't add more musicians on stage. Sure it's hard to duplicate the studio where Page could overdub all the guitar parts. But why pay money to see a band play it like on the record?
Compare how The Who played "Tommy" live compared to the studio album. Can't even listen to the studio album, because the live versions blow it away.
Pages meandering 25 minute “solos” didnt help...but Plant way over sang his own songs...kinda of similar to what the ones today do with the national anthem at the Super Bowl...