Even if we don't grasp the concept or even accept that Jesus was the Son of God, or at least not uniquely the Son of God, The fact is that the relationship between Jesus and the Father far exceeded anything that the first century Jews were used to. He taught beyond the boundaries of the written law and restored the spiritual significance of the law, exemplified in the two greatest commandments. Beyond that, He showed compassion through His miracles and healings. And ultimately demonstrated love supreme by laying down His life for his friends, which extends to us, should we accept it.
Even if we ignore the claim of Jesus being the only begotten Son, His Resurrection validated His relationship with the Father and paved a way which we may follow, thereby granting us the right to be sons and daughters of God ourselves.
In the final analysis, I don't think it is vitally important to try and figure out the nature of Christ, but rather what He did for us is important as evident in John 14:11:
"Believe me when I say that I am in the Father and the Father is in me; or at least believe on the evidence of the miracles themselves."