Not OK to be able to play only if you have a Tank and a Wizard optimized.
As for right now the warrior is really overpowered, maybe all characters are overpowered and it's just how many focus I put on warriors, I like to play as a warrior in most rpgs.
The warrior has;
-Excellent gapclosures like phoenix dive and battering ram.
-Excellent AoE dmg like dust devil and whirlwind. (which go on cd seperately)
-Excellent tanks.
-Excellent autohits.
I didn't go over all the skills, maybe the wizard has some OP spells I didn't try out. I couldn't get more warrior skillbooks, because Aureus had a bug, after I asked him to free Esmeralda.
I don't see any weakness of the warrior. The other classes are at least more squishy and as far as i've seen also deal less damage. 3 warrior, 1 healer is I think the best party combo. Especially against large groups.