John Mendelsohn, his claim to fame was how bad he missed the mark on the LZ1 review, this caused Plant to not talk to Rolling Stone Magazine for several years. Mendelsohn did not like Neil Young's Harvest or The Jeff Beck Group albums either.
Notice his total flip flop when he reviewed LZII. This review seems like he might have been trying to make up for the first, or an editor influenced his thought process, or maybe it was just the various drugs he used while listening to LZ2.
http://www.rollingstone.com/music/albumreviews/led-zeppelin-ii-19691213