After a three runs through the game on POTD, with full parties, I noticed some discrepancies on single-class T8 and T9 abilities. To create some way of measuring the deficiency, I put together the following methodology:
Part 1: Options Rating: This is an objective evaluation derived by taking the class (Priest) with highest number of T8 and T9 abilities and setting it to = 100% (normalized to 10 on 1 to 10 scale). Every other class uses the highest total as the denominator to yield a rating.
Part 2: This is subjective: 1-10 Power rankings
Part 3: Sum and Rank
Rating of T8/T9s
Priest 10 8 = 18
Wiz 8 10 = 18
Chanter 6 8 = 14
Cipher 5 8 = 13
Monk 4 9 = 13
Druid 6 6 = 12
Ranger 4 8 = 12
Fighter 6 5 = 11
Barb 5 6 = 11
Paladin 5 6 = 11
Rogue 4 6 = 10
Now there are some intangibles that should be taken into consideration. For example, the fact that anyone can cast Avenging Storm cheapens the hell out of a good, class defining skill for Druids. This isn't as impactful for high-end Priest and Wizard scrolls, since they have many other unique, class defining spells that they can only cast. In addition, some classes have horrible efficiency (cost) to use T8/T9 abilities (for what they do). Wizard also has the added bonus of not needing to pick any spells on level-up (waste zero points) because of grimoires. When I look at the resource gap, my initial list really didn't change, with the exception of Wizard moving even higher. However, I welcome anyone to expand the evaluation to include a measure of resource/efficiency.
After reflection of the initieal data, I believe the following classes need help on T8 and T9 skills (single class):
Rogue, Fighter, Barb, Druid on the critical list, with Ranger and Paladin on the consideration list. The bottom half of this list definitely needs some attention.
My preference is for Obsidian to make ALL CLASSES as fun to play as Wizards (single class). At the very least, provide way more T8/T9 powers for other classes to match the options of solo wizards and priests.
I look forward to seeing other members' thoughts.