If one judges it solely by how close the Nazi's Final Solution came to exterminating Jewry, then it came frighteningly close to completion.
Worldwide, the Holocaust killed about 35% of all Jews that were alive in 1939 (6 out of 16.5 million). In terms of European & Russian Jews, it killed close to 70% (6 out of 9 million), with over 99% of Polish Jews being murdered (almost all 3 million).
In brutal terms, the Final Solution was extremely effective - killing 6 million Jews (plus about another 6 million non-Jews) via death squads and gas chambers in a period of about 4 years speaks of the incredible amount of organization and effort that the Nazi's dedicated to this horrific purpose.
However, I would never use the word "successful" in conjunction with the Holocaust, for obvious reasons.
the ghettos came before the final solution
The Final Solution (of the Jewish question).
The "Final Solution"
The Final Solution was not implemented in 1941. By the time of the Final Solution most of the ghettos had been cleared and the inhabitants murdered.
It refers to the Holocaust. 'The Final Solution to the Jewish question', it was the plan to murder the Jews of Europe.
The Final Solution was the name of the plan. The Allies knew of the final solution through intel, but thought it was a military plan, not plans for the Holocaust.
Solution is a noun and final is an adjective and the Final Solution is a noun phrase or, arguably, a proper noun.
Children were treated good in the final solution
the ghettos came before the final solution
The Final Solution went on for about three years.
The Final Solution was the plan to rid of Europe's Jews.
The Final Solution (of the Jewish question).
"The Final Solution." Or "Final Solution." Often referred to in Nazi documents as "The Final Solution to the Jewish Question". Note that Hitler never actually came up with a specific plan - his subordinates (led by Himler and Heydrich) gathered together a committee to devise the actual plan, at the direction of Hitler.
final solution = Endlösung
Because the final solution was to kill ALL Jews
The "Final Solution"
The Final Solution was not implemented in 1941. By the time of the Final Solution most of the ghettos had been cleared and the inhabitants murdered.