I'd say it's a generally accurate depiction of the more Fi version of ISFjs (ex. my mother), but the very Se kind of could not relate.
Well to criticize is just the wrong approach. You have to say nothing, and just ask for the name of the people they are having issues with; while they are letting off steam they don't think you are going to go there telling them off; when you have the information, without telling the ISFj anything, you go there and tell those people to die, and then report back, and usually they're okay with it.ISFjs are deeply sensitive individuals for whom the normal "give-and-take" of every-day life is a threatening, anxiety-producing affair and they usually hide from confrontations however minor. Instead, they will stew. Their feelings are easily hurt and they do not know how to verbalize their displeasure without "making a federal case" out of trivial issues.
They are not the most optimistic of persons. Fearing the spontaneous side of life makes them attempt to control everything and everybody in their lives.
They have a propensity to jump to conclusions. Being hesitant to discuss any subject that may lead to their psychological or emotional discomfort, they will stand by their frequently error-ridden judgements without ever trying to verify them. Their inability outside the home to willingly confront issues leads them to "take it home" where they expect their mates to uphold and support them. They are not, however, willing listeners to criticism or advice that is not supportive of their positions, particularly if told they invite much of the abuse.
This seems generally accurate but it should be noted that the behaviour described is mostly apparent during times of stress.
So ISFjs exhibit a propensity to see one side of an issue - the side with which they agree. For this reason, they can be difficult to interact with on a personal level and their self-imposed martyrdom becomes tiresome. Every argument becomes a "poor me" statement or a "do you know how that makes me feel" statement without addressing the facts.
Their need to control in an attempt to subvert "bad things happening" can also create and transmit tension to all around them. If they are not able to resolve internal conflicts and anxieties, they, because of their inability to give voice to their inner turmoil, can bring out psychosomatic illnesses to draw attention away or to extricate them from the give-and-take dynamics of life. If not, they could explode with physical violence.
Also they have a "switch" for arguments unfortunately. They need to know what they can discuss and what they cannot. Usually they'll prod people closest to them until they explode in anger and only this way they will know that the subject cannot be touched. I have seen this happening with my mother and talking about my relationship, and with a girl I was going out with and her smoking cigarettes as an habit.
Eh, exaggerated. They can stand up for themselves pretty well, imho. Martyr isn't accurate. Usually ISFjs rarely refuse to take up an obligation but they let the other party know when it is too much.Although they are generally sweet personalities, their mood swings make it difficult for people to be comfortable with them on a continuing basis and make them difficult to understand since they do not give voice to inner and outer struggles. They are generally able to be demonstratively affectionate but only with family members within the shelter of their own homes where they tend to "own" the home, the spouse, the children, etc. ISFjs often go unappreciated because they give quietly and unobtrusively in their martyr-like way.