...if I had to rate them in order of importance I would probably go with the following order: smoothness, consistency, weight.
I respectfully disagree. As I see it, the first priority is weight because one must get the hammer back to fire the gun. All the S&W's I have bought over the years had very heavy trigger pulls...too heavy to shoot effectively. If you do not have the strength to effectively overcome the heavy pull, smoothness and consistency are of little importance. The lighter the trigger-pull the better you can shoot...as evidenced by the fact that most people with D.A. revolvers just use the single action mode for their shooting.
As a matter of course when I get a new S&W, I do a complete trigger job. I examine the lock-work for any roughness, watch the hammer fall to see if it hits the frame or wobbles from side to side (most do out of the box, should be shimmed), smooth the hammer bosses on the frame (they always have machine marks). I polish the rebound slide, both outside and inside where the rebound spring slides. I clip two coils off the bolt spring, swap out the factory springs with the graduated kits as sold by Brownel's. I smooth the appropriate parts of the D.A. trigger, swap out the trigger for the widest available. Then I test fire, test fire, test fire.
The difference I get between the as-shipped product and what I end up with is remarkable...no because of my modifications necessarily, but because if you get a new S&W (other than from their custom shop), they, as I have experienced, are assembled without any consideration for a quality trigger, just assembled from parts and tested solely for the ability to fire, called good and shipped. As far as I can see from the roughness, hammers striking the frame, out of time, etc., you are on your own if you actually desire proper fitment.
Although my primary concern is a light D.A. trigger, the rest of the work I have done on my guns has resulted in a light, smooth, trigger pull and if there is any stacking...if it stacks, it is the result of the design of the hammer spring and with a smooth pull-though of the trigger, not a significant issue with a S&W.