It's a well known fact most people consider CoP the best expansion to FFXI for 2 reasons:
1. Storyline was as classic FF as you can get.
2. Challenge.
Yes, before people cried about difficulty CoP offered a lot of challenge (Ouryu, Bahamut, One to be Feared, Proto-Ultima, Jailer of Love and Temperance.)
The only thing Abyssea offered?
1. Gear handouts
2. Ability to level from 30 - 95 in hours depending on efficiency.
The storyline was decent (it was about gear handouts mainly), but it offered really nothing. Shinryu was a good challenge, but that was a bout it.
Exactly, why not implement the good ideas from XI? And even, I don't know, expand on them like they should have?because SE stated that this game will gonna compete other mmo,s why not implement the good idea,s?