Revelation 15:1  “…great and marvelous…in them the wrath of God is complete”
Great and marvelous as part of the overall majesty of what John was seeing, and because the wrath of God is complete with them.  Only natural to want things to be right, for wrongs to be corrected, but when our hearts become like Christ’s we don’t rejoice with death and destruction.  God said He finds no pleasure in the death of the wicked, and neither should we.  I can understand John’s feelings.  I would be glad it is nearly over.

6  “…out of the temple came the seven angels having the seven plagues, clothed in pure bright linen, and having their chests girded with golden bands”
Angels with the last plagues come out of the temple.  They look completely pure and holy.  The final wrath of God comes directly from Him.  All is totally just and righteous.  Beginning of the end.

I hope you enjoy reading and studying His word.  May it accomplish what He desires.  Please feel free to comment or post questions.  Thanks for reading!

Scripture taken from the New King James Version®. Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.