One thing about them is that they are Franciscan, and what we know of Franciscans from history is that they tend to split, even in Francis' own lifetime there were divisions. Francis was an inspirational charismatic leader but not that good an administrator, therefore we shouldn't be too surprised that his faithful sons and daughters exhibit the same tendency as his first followers.
There are several stories that are quite shocking about Francis' demand for obedience from his followers, for example telling a brother to bury himself to bury himself in a dunghill until he had "died to self". The FFI are a new order and they are flourishing, their founder Fr Stefano Maria Manelli however, who is certainly inspirational, has been accused of 'certain irregularities', hence his removal and replacement by a Capuchin appointed by the Holy See.
The problem with zealous young orders is that often they lack the restraint of older moderating influences, they grow too quickly, they are charismatic. One of the problems with Manelli seems to have been his reliance on Franciscan obedience, which basically boils down to his will imposing the EF on the FFI rather than a consensus being achieved, though it could be argued that there is a consensus among the younger friars but not the older ones. The Pope's words on Pelagianism in the new religious orders certainly applies to the Legionaries of Christ and might possibly apply to the FFIs, it is the problem the early Franciscans had when they took Francis' will as trumping everything, a problem too for Blessed Theresa of Calcutta's sisters.
With the FFI it seems that some of the original friars wanted to hold onto the original charism of dedication to Mary Immaculate, Manelli seems to have tweeked this slightly by adding 'a preference for the traditional rite'. Whilst the young friars happily seemed to have embraced this decision of the founder, some of the older founding friars have objected that that was not what they had signed up to. Hence the Holy Sees demand that they return to the Ordinary Form of the Roman Rite from mid-August, presumably until a consensus can be arrived at.
What is beautifully Franciscan about is the docility of the Friars themselves to the Holy See.
Pray for the Friars.