For someone here to answer this question in a meaningful way is almost impossible, because an actual trigger pull weight would have to be supplied (measured by a reliable trigger scale) for us to know. Just to say it has a heavy trigger weight doesn't mean much because heavy to one person might not be heavy to another. I don't doubt that your own Revolver has a lighter pull weight but that could be for many reasons such as it was worked on, has a different set of Springs, broken in, etc.
Most S&W Revolvers that I have owned and or shot (Factory settings) are approximately 10 - 13 pounds for double action and between 3.5 - 4,25 lbs for single action. I'd bet most here have at least a few revolvers s that are designated Target Guns and have pull weights far below the Factory weights, but that was done after the purchase. ALSO...... revolver's will break in and loosen up a bit as they are shot.
Many fella's new to Revolvers and who are use to Semi Auto's would also say that Revolvers have a very heavy and long DA Trigger pull weight compared to what they are use to - and obviously so since most Striker fired SA's have a pull weight of about 5.5 - 7 pounds and traditional SA's (such as a 1911 design) would be below that in many instances, therefore making a Revolver Trigger weigh seem excessively heavy.
If after actually weighing the pull several times it does show an overly heavy pull weight, there are options to remedy that - but first an actual weight has to be determined.
PS: If you do buy a scale, make SURE the model you buy goes up to at least 15 pounds. There are many scales that only measure up to 8 pounds and would be useless for most Revolvers. The other option would be to send the gun back to S&W after having someone confirm that the pull really is excessive by actually weighing it.