Review: Rob Reiner's Spinal Tap II: The End Continues is more of a downer than one would expect from Spinal Tap

This Is Spinal Tap is a landmark comedy, not only popularizing numerous stars—Christopher Guest, Harry Sheaerer, Michael McKean, and director Rob Reiner—but cementing the “mockumentary” as a staple of cinematic comedy.  Though it was hailed as one of the best films of 1984 when it came out (Rogert E…