On the Wu Jen, I honestly haven't reviewed their list enough to say for sure whether they're T2 or 3. They don't have enough options to be T1, so it's just a question of whether a DM would have to seriously alter a campaign (either in rules, agreements, or plot) to keep them from blowing things out a bit, or not.
I'll make a list of important spells that Wu Jen have of each level, and a list of important spells that they seem to be missing off of a core wizards list, if I miss anything feel free to point out what I missed.
Level 1 Disquise self, Charm Person, Animate Rope, Protection from Good/Etc, Shield, Scales of the Lizard, Secret Signs, Comprehend Languages, Sleep, Summon Monster 1-IX, Ventrilquism, Silent Image.
Missing Spells Color Spray, Cause Fear, Ray of Enfeeblement.
Level 2 Alterself, Invisibility, Fog Cloud, Protection From Arrows, See Invisibility, Rope Trick, Detect Thoughts, Misdirection, Knock, Arcane Lock
Missing- Spells Glitter Dust, Summon Swarm, Web, Command Undead, Specteral Hand
Level 3 Greater Magic Weapon, Keen Edge, Water Breathing, Stinking Cloud, Gaseous Form, Dispel Magic, Haste, Remove Curse , Suggestion, Tongues
Missing -Spells Explosive Runes, Ray of Exhaustion, Vampiric Touch, Wind Wall, Clairvouyance.
Level 4 Solid Fog, Ice Storm, Scrying, Dimension Door, Polymorph, Greater Invisibility, Animate Dead, Dismissal, Charm Monster, Locate Creature, Minor Creation
Missing- Shadow Conjuration, Arcane Eye, Hallucinatory Terrain, Black Tentacles, Secure Shelter, Dimensional Anchor
Level 5- Fabricate, Dominate Person, Baleful Polymorph, Telekinesis, Summon Wind, Passwall, Wall of Force, Major Creation, Teleport
Missing- False Vision, Magic jar, contact other plane, Transmute Rock to Mud
Level 6 Flesh to Stone, Control Weather, Control Water, Speak with Dead ,Spirit Binding, Move Earth, True Seeing, Veil.
Missing -Guards and Wards, Analyze Dweomer, Legend lore, Mislead, Circle of Death.
Level 7 Scrying, Greater, Body Outside of Body, Energy Immunity, limited wish, Reanimation, Power Word Blind, Ethereal Jaunt.
Missing- Simulcrum, G Shad. Conjuration, Reverse Gravity, Project Image, Forcecage, Mage's Mansion
Level 8 MindBlank Polymorph any Object, Find the center, Whirlwind, Sympathy-This is a pretty dud spell level
Missing Dimensional, Maze, Trap the Soul, Moment of Prescience, Screen, Charm Monster Mass, Clone
Level 9- Astral Projection, Freedom, Dominate Monster, Shape Change, Gate, Timestop,
Mssing-Missing Disjuction, Refuge, Foresight, Shades, Weird, Wail of the Banshee.
Wu Jen is Missing more than I want it to be, and while it can Scry and Die, it can't defend itself from it like the wizard can, its lacking in Necromancy, Divination, and area illusions outside of the silent-persistant image line, nightime base spells, and outsider removal. Missing Explosive Runes on the broken spell front. I have to say tier 2, it can't play rocket tag like the wizard can. It still gets enough breadth of spells that it isn't going to fall much behind a core sorcerer.
As for adding spells to its spell list the Spell Compendium says "Add spells with element (except air), wood, and metal themes." pg 4.
One issue I have is that soulborns may have a good level of versitility, so they might be tier 4. I just discount them heavily due to the other incarnum classes.
Um what? I love the totemist... but I feel no love for the soulborns. It's like a wimpy pally
The other incarnum classes blow soulborn out of the water. If your going to test out a new system your not going to play a class that barely touches that system is what I meant. But I'm going to take a close look at soulborn and see what it can do.