Hey free is free, so I can't complain, plus I was able to use it three times in my last trip which saved me quite a bit of walking between the three casinos and going to various attractions within those casinos.
I love that they offer this free tram service and I only wish that they made the waiting area inside like at Mandalay Bay as it is outside for both Luxor and Excalibur. In the winter it's a bit chilly but still can't beat the extreme convenience in access to the indoor areas. Definitely better than if you were walking through the strip!