I was involved with Newfrontiers (NFI as it was then) for 2 years from 1996 to 1998 and agree with much of the above. Leaders within the organisation pick out a few select passages from the new testament and then regard these as a literal blueprint for how they should organise themselves. I had no experience of any religion before NF, and after realising what they were like I wondered initially whether my experience was a one-off or a peculiar feature of the local group that I was attending. I have since visited 3 other NF groups out of curiosity and found similar views expressed in all of them.
The main problems that I found were that the organisation doesn't tolerate much disagreement, and in common with other evangelical churches the new testament is regarded as the final authority on what everybody ought to believe and on how everybody ought to behave. Anybody who dissents or disagrees significantly with the party line is not welcome. Belief in the God-given authority of their leaders (men only) and belief in dark spiritual forces at work in the rest of society feature a lot in the theology of the organisation, both of which perhaps explain their attitude towards dissent. I believe that there is a tendency for members of the organisation to equate its own aims and objectives with God's aims and objectives, and therefore any criticism of them is regarded as opposition to God.
Their website has quite a few talks and papers that are very informative about where the organisation stands:
Attitude to scripture:
http://www.newfrontiers.xtn.org/resources/talks-and-preaches/select-speaker/wayne-grudem/Attitude towards authority:
http://www.newfrontiers.xtn.org/uploads/Spiritual_Authority_updated___John_Groves___recd_5309.pdfTalk on spiritual warfare (from an NF church website):
http://jubilee-church.org/sermons08/spiritual_warfare_TK.mp3