I concur with the other opinion presented. The most difficult part of this forum is the lack of photos. We can only provide information based on our experience. It really is a matter of outcomes matching expectations. If one hope for laser to tighten skin, they might really be hoping for a reduction in the appearance of jowels, for example, which in a 50+ year old patient, may well require a face lift to do.
I always ask patients to show me in a mirror the change they are hoping to see... if they pull anything up or back, we discuss surgery. There really is no laser that can effectively do that. That being said, nearly every face lift patient of mine opts for skin treatment concurrent with the lift in the form of laser, plasma (no longer available), or light. I concur that the CO2 is the most bang for the buck, with the Active and Deep FX system yielding the best overall results.
Undoubtedly, if you were hoping to see a lot of tightening or wrinkle reduction, Deep FX is mandatory, most commonly around the mouth and eyes. Active FX is really the polishing touch. I would not think that Active FX alone would yield significant tightening, especially if your definition of "tightening" is different than ours. That is, if you were hoping for results that warrant a lift rather than laser, etc.
I don't think what you did was a waste, it just might take a different tool (surgery) to get the result you're hoping for. Again, without the photos, it's tough to advise, but hang in there.