I did enjoy Gundam SEED. But my impression of Gundam SEED Destiny, even after watching it TWICE, was very poor.
Like I watched through Gundam SEED like 3 times? But SEED Destiny only twice (first time and a second time where I forced myself to give it a second chance). Not counting watching random eps off of GundamInfo at random. <<;
But my general impression of SEED Destiny was that there are cool scenes. There are episodes that were constructive and good, but there were also WAY TOO MANY parts where it was either a bore, or like literally half of the episode was flashbacks. And then, there was also the problem where there were like multiple episodes that dwell on the same flashbacks. So, you get sick of seeing the flashback, even if it's, in reality, not that many times. It just feels repetitive and kind of... ugh? There were good parts of SEED Destiny, but sitting through the flashback bonanza just to get to the plot-constructive parts is just... a pain.