I would love to see some sort of talent trees similar to what WoW and kotor use to have. It made it feel like it was your character, not just another warrior or healer. Without talents, aside from what the characters look like, there is no difference between them. You can say that skills and how the person fights makes a difference but it really doesn't when there is a set rotation that the skills are supposed to be used in. Talents give players more freedom to play and do it however they find the most fun.