I tend to see people who are not passionate as sort of "ineffective". They're people who, to me, lack charisma of any kind, and have no power of persuasion over me or anyone - or anything. For most people to be persuaded by anything, they need to see that the person persuading them believes in it themselves. For this, passion is required.
I don't think NT's generally lack passion. The only two people I can think of who I think lack passion are an ISTJ and an ESFJ. In the case of the ESFJ, it's probably just lacking the appearance of passion, because I know she feels strongly about things - she just hates conflict so much that she won't SHOW passion in disagreement or putting her points across; she doesn't like to cause a scene. With the ISTJ, I don't know if there is any passion in there... I mean, his strongest positive reaction I've ever seen is for him to say something's "not bad", and his strongest negative reaction seems to be just a look of contempt whilst not saying anything.
INTJ can perhaps seem to lack passion, but I know they don't really - they just save it up. They can sure show it when the time's right, when you rile them up enough
That's my thoughts on passion, anyway...
Lack of compassion tends to make someone basically a jerk. Example: kids playgroup, one kid with very poor parents - it's her birthday today. They can't afford to get her a gift or a cake, but they've got a pack of cookies that they've brought in and this kid is trying to get into the spirit by offering cookies to the other kids. But several of the parents instruct their kids not to take a cookie and then one parent confronts the mother and tells her off, reminding her of the group's healthy, organic food policy. She and the non-participating parents think they're being ethical. I think they're being compassionless jerks.