Bug fixes are nice, yeah. But everyone going "ZOMG RUSH IS IMPROVED" either hasn't played the sets (which I did via CTE) or probably won't touch Rush in general. I've put in enough time to have 100-150 "service stars" in that mode, so around 100 or 200 hours since it takes longer to get stars in that mode than Conquest. I've put up with it since I really like Rush in Bad Company/2 and BF3. But BF4 was supremely disappointing. The "improvements" are small and helpful, sure. But they don't fix some of the design issues that the maps have. A few of the sets don't really change from "dead stops" except into a small tug-of-war where the attackers still lose or the defenders get rolled over due to the lack of changing the map for the mode.
I think a lot of people should temper expectations. CTE is doing "good work" but it isn't a "massive improvement" that a lot of people are thinking.