Shadowmage needs to be fixed. Currently they can Hybrid WAY too effectively and they are by far the most OP class. I would suggest splitting their stats so damage skills are only effective with INT and heal skills are only effective with WIS. By doing this you'll still be able to Hybrid but not as effectively as going INT for damage and WIS for healing.
INT and STR stats need to be adjusted. They don't feel like they have any use at all. As things currently are I could level up to 42 without using a single stat point and be just as effective as someone with full STR or INT--this just isn't right. If this is as designed, then why let us put stat points in as we level? Just automatically assign them for players so they don't notice they don't have an effect.
I do not consider SM overpowered. I consider Paladins underpowered, and Sorcs Underpowered. Warriors are very close to where they need to be.
Your statements here also contradict one another:
In one you say,
"Int should be less powerful."
In the other you say,
"Int has no use at all."
Int adds 1.2 Magic attack on a Sorceress, 1 Magic attack on a Shadow Mage. In addition, it adds .5 magic crit, and 1 poison damage per 50 Magic attack (10 Int).
That adds up to about 15% of combat overall parameter, and there are about 4 other factors, like skill damage, rune buffs, defense and attack bases, and enchants. Imo, that's pretty balanced. Believe it or not, 15% is where base stats currently are on Shaiya as well. Granted, linking increases stats sizably in shaiya, Linked stats only account for about another 15-20% of combat parameters. In other words, the balance is in line with another AGE successful game.
I have a feeling you don't know how powerful bosses are in this game btw. The most uber SM's will not be able to tank them. Furthermore, even at max heals, they will only heal 1/4 of a Paladin's HP, and only 1/3 of a warrior's. The game at 42 will be much different than the game at 25-33.
Level 40 Heroic/Legendary Weapons have 163 or so attack on a long sword, and 286 on a broadsword. How is that backwards?
I'm guessing you might be referring to the fact that low weapons enchanted to  are similar in attack since enchants are linear( Putting level 30 longsword and broadsword differences at only about 40.
I'll repeat something as Pure puts it:
A warrior with a good team is the most powerful class in the game.
A warrior with no support is the weakest class.
They have strong skills all around. The problem is they are all offensive. Their damage addies are the highest in the game (Deathblow adds 190). In pvp, they kill faster than any other class. In parties with support, they are also the fastest killing class.