It all depends on who you are talking to about Gundam 00.
Seeing as we don't live in a perfect world we can deduce that all series aren't going to be liked by every fan (or viewer) in the world.
As I already stated the ending for the 2nd Season wasn't something that I liked as much as the 1st Season ending.
One of the things that I didn't at the end of the 2nd Season was the mass cloning of the red haired Innovator to make suicide attacks on the enemy vessels.
Mass producing an Innovator by the thousands is taking things a little too far in my opinion.
Had Ribbons instead kept the cloning procedure at the limit of no more than 10 clones and upgraded their fighting skills, then I definitely would enjoy the ending more.
As for Gundam Wing (GW) comparisons to Gundam 00 goes, GW could have done a better job of giving background stories about the Gundam pilots and other characters had Gundam Zero got animated.
Some fans say watching Gundam Wing: Endless Waltz can help with resolving some background information on the main characters, which is true to an extent.
But the sad truth of unclear background stories of main and secondary characters still remains to be only to be seen in manga's.
1) Trinton Bloom relationship to Catherine Bloom.
2) Wufei wife (Meilan) that died protecting the colony they lived on; which, in turn explains the reason why Wufei calls Shenlong Gundam by Nataku. And it also explains Wufei obsession about not picking on the weak and fighting for Peace in the world.