I consider NORG a high point of Disk 2.

Just Saiyan.

Let's break this trout down.

Disk 1
Pros:
Abundance of Seifer
Dollet landing
Sorceress Assassination build-up

Cons:
Quistis abandoning her post and forcing us into a Sewer Level

Disk 2
Pros:
Garden Civil War/NORG
Balamb vs. Galbadia
FH Concert (? maybe)
Final confrontation with Seifer and Edea

Cons:
D-District Prison
Orphanage Reveal
NORG Subplot going nowhere even when you visit Shumi Village
The Garden controlling like ass
Lack of Seifer
Rinoa's father being completely ignored

Disk 3
Pros:
Ragnarok Scene
The Ragnarok itself
....

Cons:
Seifer's character receiving no closure or proper resolution
MONSTERS FALL FROM DA MOON DIDN'T YOU LEARN THIS IN HISTORY CLASS APPARENTLY NOT
Laguna's defeat of Adel being tucked away in an optional flashback. Actually, I think Disk 3 had all the worst Laguna flashbacks.
Again, Rinoa's complicated relationship with her father being forgotten about completely