Off- shoots of Adventism

Today I decided to focus on on the relationship between the adventist church and those splinter groups who have broken off from the Church. These 'off-shoots', dissidents and break away factions are regarded
as anathema by nearly all of mainstream adventism. Many times they are viewed with suspicion and deemed as fanatics and cultish. We can't deny history with the likes of Koresh etc. These incidents are facts and add to the image we have of those who have departed from the adventist church. Many times in the past I was repeatedly told by those mature adventists to have nothing to do with the 'off-shoots' as they are very cunning and can easily brainwash folks to join their church. Well contrary to all that was said a group of believers decided to have a study with a particular group of 'off-shoots'. These people were sincere, dedicated Christians who had strong convictions about certain issues (humanity of Christ, Jones & Waggoner, righteousness by faith, etc). These brethren were (and still are) diligent students of the Bible and the Spirit of Prophecy. The reason I believe that mainstream adventists avoid them is that we as a people are too lazy and don't know the Bible and Spirit of Prophecy as we ought to. If we as a church are reaching out to others of various faiths why not reach out to those who are closest to us in doctrine? To be honest we as adventists don't know or care in many instances what these people believe or hold as doctrine. Given that they may err on many points (they were unable to refute many Spirit of Prophecy quotes about not forming new church organisations etc) I actually learnt a lot from them and they have some good ideas and insights. So let us not cast them off. We must study with them, learn what their doctrines are and refute the wrong. The attitude of some adventists to these 'break away' groups ia akin to that of the pharisees and scribes of Jesus' day. Now there are some factions that I have studied with who are very insultive and do not have a Christlike disposition, because of this are we to condemn all the off-shoot brethren? In closing I must say I am still a member of the adventist church and still hold fast to the doctrines of the church. I have not seen one 'off-shoot' faction that I can join. I still hold to and believe that the adventist church is the church and as such I can't leave to go anywhere else. What's your take on this?