Does mesotherapy really get rid of cellulite, or are all anti-cellulite ads just gimmicks?

Little evidence. I'm not a big fan of mesotherapy, and am not aware of any significant well done study, published in a peer-reviewed journal, that documents its safety and effectiveness. I don't recommend it to my patients. There are reports of complications. See http://www.Ncbi.Nlm.Nih.Gov/pmc/articles/pmc3002412/ & http://www.Livestrong.Com/article/234119-complications-of-mesotherapy/.
All gimmicks. Cellulite is an annoying problem to millions of women. It is caused by an uneven superficial fat layer as well as tiny ligaments that hold the skin down. The only effective treatment is called cellulaze by cynosure. It is a one time minimally invasive procedure that permanently removes cellulite. To find a provider in your area go to www.Cynosure.Com.