The reason why chabad has been so succesful is indeed similar to MO, & that is because the standards are low. It’s easier.
BS”D
No, it is because Chabad does not pressure anyone to go too far too fast and accepts that not everyone will reach the level of a true Chabad chossid, nor is it our aim to create Chassidim when we know that for many of the people who become involved, even keeping basic kashrus is a huge step.
Surprise – the standards, as opposed to the hashkofo, of a Chabad chossid are not unlike those of Satmar (yes, I know we have a tznius crisis and a parallel OTD crisis but based on posts here and articles elsewhere it seems the crisis is everywhere – it is just that since we “get around” more our problems are more noticeable).
We do not have “my way or the highway” (silly, immature comments here and there by the teen and young adult crowd about “snags” notwithstanding) and we are open to all (getting thrown out of a Chabad House or Chabad shul is a real achievement, kind of like lehavdil managing to get arrested for marijuana possession in S. Francisco or Berzerkely or having ended up in the remedial class at the Chelm Yeshiva Ketono if such a thing existed).
I am not a shaliach myself, so that I am amazed at how my friends who are shluchim deal with some of the challenges that are presented to them by the conduct and beliefs of visitors and community members alike.