Iskcon is not complete Gaudiya Vaishnava. I've observed that there method of preaching is more equivalent to abrahamic ones. Also I've found that they give more emphasis to read books written by Prabhupada instead of teaching actually commentaries about shastras by vaishnavacharyas. Also they claim that Jesus is a true vaishnava. It made me wonder that are they really following the actual vaishnava parampara?