To me duel needs ripped out and started again. I love the facade, the entrance and first hall with the dolls house (face in fire or not) and the station, but everything after is fairly awful.
The reasons for this in my opinion are;
1) the lighting is awful, and has been touched upon many times. However as well as the lights illuminating the moving parts of the animatronics, they also fail to properly light up the scenes. A lot of the time I've no idea that I'm supposed to be in someone's house.
2) the targets for guns, being bright LEDs distract you from looking at the scenes anyway. The better shooters I've been on (Buzz Light-year, and in perticular Men in Black) use targets that's are part of the scenes, this forces you to look at the scenes and appreciate them and animatronics. The ones used at towers largely distract from them. There is also far too many at some points.
Personally, I'd rip the guns out and turn it back into a decent haunted house. But I think there is no chance at all of that happening. As it stands it's a filler attraction and regardless of what they do with it it will probably stay as such. Most guest will ride it once per visit and move on.