Yes talents are in need of some revamping.
Oppurtunist really is not equivalent to the computers ability to use it and make AoO....its inconsistent and unreliable.
Packmule is a watse i also dislike stench...funny i kind of think of bairdotr as being disgustingly filthy and unclean as well.
Leech and zombie i would never take either youbare correct they feel evil.
The situation with talents gets worse and more obvious on following playthroughs. I am on playthrough #8 and i am frustrated and disgusted with talents pretty much.