I have to agree. Traps are useless. When I hit an enemy trap it does way more damage to me, then the trap I set for monsters. My other beef, is that I can't set more than one trap either, which is a strange artificial limit. I love turn based games because it allows me to play strategically. I should be able to place more than one trap in order to shape a battlefield to my liking. There are several areas in the game where multiple traps are laid out for me to trip over, so it seems unfair I can't do the same.
Baldur's Gate got it right. My thief could set multiple traps, and I was rewarded for developing a good battle plan.
My last complaint is that after I discover a trap, my party does not walk around the trap. I sort of expect the path finding algorithm to give my party the common sense to walk around a known trap instead of straight through it.
Overall, I'm enjoying the games, but as I said, traps are useless.