That was an awesome end to The Clone Wars! The last 4 episodes tied everything in perfectly.

This whole show went from, “Eh!”; to, “Holy Crap,” the last few seasons; to “Holy $4!..” the last few episodes.

Spoiler Alert!!!
This is a great tie-in for everything. Revenge of the Sith is woven in perfectly and Rebels gets a reference too.
That shot of Vader walking away from that rusted/weathered Clone helmet symbolizes, literally, the death and end of The Clones Wars as he (we) once knew it. A man turned into a machine. A shell of his former self. The War was won, it was finally over, but at what cost!
Spoiler Alert!!!