I am very pleased with the sort of development writers have given Wraith characters like Michael, and Todd. But even in the earlier seasons, we saw a wide range of excellent examples of Wraith 'personality' - from Steve's dignity and conceit, to the Defiant One's savagery, to the high-minded, high-living Wraith in Condemned. These, along with well-developed characters like Todd and Michael, have made the Wraith the most intriguing characters in the show. Well, at least for me.
I fear that TPTB feel the Wraith are expendable, and will throw them away in the next season or two in favor of a new enemy. I hope that doesn't happen, for in the Wraith we have a wonderful study of conflict - and conflict is the driving force behind all of your best fictional characters.
Personally, I love the conflict that exists in the Wraith, and would hope to see further exploration of it. They maintain a self-controlled, somewhat dignified image, while inside struggle with a constant hunger. Perhaps Steve - as he appeared to meditate while in captivity - gave us a glimpse of how Wraith deal with their hunger and overall frustration when unable to freely feed. It would be interesting to see more of this...to see how Wraith fight any display of weakness when they are hungry...until they are unable to fight it any longer. We've seen a little of this with Todd and Elia, but I could certainly handle more.
There is also the beautiful contrast in them between their refined human traits and their animalistic Wraith cravings and behavior. Again, a very interesting study - the inner 'animal/man' struggle that works so well in the development of a character. The Wraith do not struggle with the 'animal' - or Wraith - inside, instead they embrace it as their nature, their identity. No, their struggle is against what they perceive to be the human weaknesses. Since it has not been fully explored, it would be nice to see some of this turned around - to see some Wraith (not altered ones like Michael) embrace their humanity, and work on from there. Todd, in part, has shown us this, but we still are not aware of his true intentions, and for the most part, he still seems quite pleased - and proud - to be Wraith.
I think we've only seen the tip of the Wraith iceberg, and my hope is to see much, much more. I imagine so many possibilities for these characters, and hope they will continue to be developed with care in the show. I think some fans can now see them as something other than 'evil'. True, some individual Wraith may have an evil streak, but as a whole the Wraith are only seeking to satisfy their hunger. They are condemned solely upon what they are at birth, and nothing else, even before they feed upon their first human meal. It is something truly out of their control. It is - their nature.