I'm going to say it just depends on the school. The curriculum in gracie jiu jitsu is actually pretty good. The problem is that you don't do any sparring until you finish it(Again this depends on the school). So depending on your schedule it may take over a year to get all of it done, while if you went to another school you would be positional sparring with no submissions the first few weeks then building from there(again this depends on the school, but the schools I visited afterI moved all didn't allow full sparring for students for at least a month or 2). At the end of that year you would be a way better grappler than someone who was only doing the Gracie curriculum. I'm saying this as someone who started in GJJ then moved to another school when I moved. I had stripes on my belt, but no sparring and I was getting destroyed by people who had less time than me on the mats. Gracie was a good warmup intro into BJJ, but the lack of warmups(shrimping, break-falling, tumbling etc) does a huge disadvantage to students when if they are learning these things from day 1 they can build upon it. With that said GJJ brings you in slow and once you have some skin in the game your less likely to quit. Also if you stay at the GJJ school and move to master cycle it does come with that gut check when sparring is added.