Yeah, you can't escape the "Roger Roger" droids, lol. (although there are a LOT of episodes without any of them in sight. I can't remember them being that present in the last seasons).
But, let's take an exemple of how good the show improves: a lot of people, including myself, could not stand the character of Ashoka Tano at the beginning of the series. But guess what, by the end it's almost the best character of the series.
The story arcs of certain characters are very interesting. Some ideas, that you could think would be completely idiot on paper, works quite well in the format of this CGI TV-series.