The Restoration was a wonderful idea.
In the early 1800's, some preachers recognized independently of each other that Christian unity might be easiest if everyone would drop the `creeds' and `traditions' of their denominations and just go back to the Bible.  The goal was 
1) for everyone to replicate to the 1800's the New Testament church, and stay there,
2) for everyone to have the Bible for their sole authority on matters of faith and to study and follow it for themselves.
One of the leaders of this movement was a Baptist preacher named Alexander Campbell.
A common doctrine was baptismal regeneration and by immersion.  A decreasing number of people are sure about this, and some have rejected it -- including me.
Slogans:
"Where Scripture speaks, we speak; where Scripture is silent, we are silent."
"In essentials, unity; in opinion, liberty; in all things, love."
Some at present use "We are Christians only, but not the only Christians."  I do not know if that was original to the Restoration.
It was a great idea.  The movement had two problems:
1)  Not everyone was willing to drop their denominational baggage,
2)  After the original leaders died, the movement was hijacked in a lot of areas by men who despised the original messages of liberty and unity.
The result of the latter:  we have three denominations.  One is the hard-line Churches of Christ, many of whom would actually punish anyone who would dare acknowledge anyone outside of them to be Christians.  They also do not have `opinions' -- everything their leaders teach is what the Bible says, period.  Also, they believe that the silence of the Scriptures speaks:  it condemns.
Another denomination is the Independent Christians.  Some Churches of Christ associate with these also.  It is most on track with the Restoration.  "Christians only, but not the only Christians" is the idea.
A third denomination is the Disciples of Christ.  Liberty of opinion is highest in this group.  However, they made the decision to become a full denomination in that they have a denominational headquarters, and they accept baptismal ceremonies that do not involve immersion.
The Restoration has not really failed.  Regardless of denominational status or not, all Christians can still cooperate around what we can agree on about the New Testament Churches' Scriptures, and share unity of purpose:  to serve the Lord.