As a Star Wars fan and Clone Wars fan, I appreciate how the story telling has matured while at times maintaining its levity.
Season 6 was worth watching for the die hard Star Wars fans, filling in gaps leading up to the eventual "Episode 3" outcome.
I enjoyed the story arc involving Fives and to a lesser extent Tup. It added another dimension to what otherwise would be "generic" Clone troopers..."those with slight personality variations but basically are highly trained do good-er soldiers".
The unfortunate thing is that Clone Wars had to end so we do not get to see some of our lesser, favorite characters continue to develop. We have to leave everything to Episode 3 and Star Wars Rebels.