Right, my 2p...
I was 19st 1lb at Christmas. The 6 months before that I'd being doing WW, the 12 months before that I'd spent on Slimming World. I started in the first place 18 months ago at 18st 5lbs, so in actual fact ended up gaining 10lbs in 18 months 
I'll talk about SW first: I worked out I actually lost 30lbs in the year I was on SW, problem was it was the same 10lbs 3 times
. I never ate mug shots but I did have a muller light in my overnight oats every day pretty much. I cooked everything from scratch, ate a ton of veggies and fruit but also ate pasta, rice or potatoes every day and my diet was pretty much entirely fat free. All the dairy I ate was skimmed or fat free and I cooked with fry light or just with water. I regularly lost 5lbs in a week, biggest ever loss was 7lbs in my 3rd week. I went to group every week and stayed for the talk, was slimmer of the week a fair few times too. Problem was I'd then end up gaining any weight I'd lost in the next few weeks without any visible change in my eating habits
.. I decided to track my food in MFP to find out where I was going wrong, and it turned out i was eating on average between 150-250g sugar PER DAY. I developed a dark ring around my neck that looked almost like a bruise too, I know now this is a tell tale sign that you're in the early stages of insulin resistance (pre-diabetes). I spoke to my SW leader about this because I was really concerned about my sugar in take, and she told me off for using MFP to track my food as "that's not part of the plan". All the sugar was from yoghurt, fruit and "allowed" foods, as well as some on hot choc I had out of my syns. My in take of fat was also almost nothing and I'd started to read how this could contribute to feeling hungry etc. I was eating every 2 hours every day and this was totally acceptable on SW and treated as a good thing that i was "keeping hunger at bay" by snacking on fruit 
My weight loss then gain cycle by the way was because the sugar was sky rocketing my blood sugars, then crashing. The crash would then make me hungry and need to eat 2 hours after my last meal, so I'd eat more sugary food to compensate. I lost weight on the weeks where my sugar intake was lower, gained on the weeks where it was higher even though each week i was using the same number of syns etc etc. Only discovered this after tracking in MFP.
Anyway, I heard WW had swapped to SmartPoints and these tackled sugar so I left SW and joined WW. Same thing happened. Pretty much no fat in my diet although more protein. No yohurts and less sugar generally, but still loads of fruit and veg and carbohydrate. Again, I lost and gained the same 10lbs over and over until just started consistantly gaining them. This was because the "this food is bad, this one is good" mentality really settled in and I developed a seriously unhealthy obsession with tracking my food. If I went over my points, that was it. Full on binge followed by then not eating or drinking the day of weigh in and trying to "empty" myself that whole day so I wouldn't show my binge on the scales at the group.
I had the forethought (thank Goodness!) to recognise this was really really unhealthy and my obsession with food and my binge cycling was going to make things worse. So one day I just stopped.
I started to research sugar, the effects of weight loss clubs and dieting on mental health etc etc and eventually came to the conclusion that it's all complete bollocks. By this point I was 19st 1lb and at my all time lowest in terms of self confidence and body image.
Then I started researching fats, sugar and macros in general. I needed to do something about my weight, so I joined the LCHF (low carb, high fat) bootcamp on here in Feb. I'd already lost my 10lb gain from Jan to mid-feb just by not dieting
.. I was eating a moderately fatty, moderate carb an high protein diet and dropped 10lbs in 4 weeks.
Anyway, LCHF has completely changed my life. I don't diet at all anymore and I don't snack or eat outside of meal times at all. I now weigh 15st 10lbs and I'm dropping weight at a rate of about 2lbs a week pretty much although I no longer weigh myself regularly (once a month usually although I haven't weighed for about 5 weeks).
I love my food again. I eat cheese, cream, olive oil, avocados, oily fish, loads of none-starchy veggies and a few berries now and again. Never have I ever enjoyed food more and I'm a much MUCH better person to be around now that I'm not obsessing over my weight.
I don't pay anyone for the privilage of losing weight and I don't have to put my faith in anyone elses plans, just on my self and my own new found knowledge on how to actually eat a proper, rounded and balanced diet. When I want to maintain my weight when I'm comfortable with my shape, I'll probably increase my in take of carbs until I stop losing weight :) Simples.
Sorry for the epic rant, I just think we're losing sight of the actual issue with weight loss programs: I.E, they focus on weight loss primarily and not effective, perminant change.