First of all, Jesus isn't what we want him to be. He is what God called him to be. He is a lawgiver and presented as a new Moses in Matthew - and Matthew never refers to him as "Savior."
Secondly, "or" is the wrong connection. Jesus is lawgiver, a new Moses, and our Savior.
What Walther had to say about such a view...
"Thesis V.
The first manner of confounding Law and Gospel is the one most easily recognized — and the grossest. It is adopted, for instance, by Papists, Socinians, and Rationalists, and consists in this, that Christ is represented as a new Moses, or Lawgiver..."
http://lutherantheology.com/uploads/works/walther/LG/theses.html"In Canon 21 [of the Council of Trent], adopted at its sixth session, this synagog of Satan decrees:'
If any one says that Christ Jesus has been given by God to men that He should be their Redeemer, in whom they are to trust,
and not also their Lawgiver, whom they are to obey,
let him be anathema.'
This decree overthrows the Christian religion completely. If Christ came into the world to publish new laws to us, we should feel like saying that He might as well have stayed in heaven. Moses had already given us so perfect a Law that we could not fulfil it. Now, if Christ had given us additional laws, that would have had to drive us to despair. [emphasis added]
The very term Gospel contradicts this view of the papists. We know that Christ Himself has called His Word Gospel; for He says in Mark 16, 15: “Go ye into all the world and preach the Gospel to every creature.” In order that the meaning which He connected with the word Gospel might be understood, He states the contents of the Gospel in these concrete terms: “He that believeth and is baptized,” etc. If the teaching of Christ were a law, it would not be an eujaggevlion (sic), a glad tiding, but a sad tiding...
All the apostles corroborate His teaching. John says in his gospel, chap. 1, 17:
The Law was given by Moses, but grace and truth came by Jesus Christ. He places the Law over against grace and truth...
In chap. 3, 17 the same apostle says:
God sent not His Son into the world to condemn the world, but that the world through Him might be saved. Quite plainly the thought that Christ came into the world to proclaim a new law is barred here. Had that been His object, He would have come to judge the world. For the Law passes judgment on sinners. However, God did not send his Son to pass judgment on the world, but to save the world through Him. By the term world the Lord refers to mankind in its apostate and lost condition, to the lost, accursed, and condemned sinners that make up the world. To these the Savior brings this blessed doctrine: “Though You have broken every commandment of God, do not despair; I am bringing you forgiveness and salvation here and hereafter.”
In language so plain that it requires no comment the apostle states in Romans, chap. 1, 16. 17:
I am not ashamed of the Gospel of Christ; for it is the power of God unto salvation to every one that believeth; to the Jew first and also to the Greek. For therein is the righteousness of God revealed from faith to faith, as it is written, the Just shall live by faith.1 Tim. 1, 15 we read:
This is a faithful saying and worthy of all acceptation that Christ Jesus came into the world to save sinners. In view of these plain passages, is it not a horrible teaching of the papists that what is called Gospel in the Scriptures according to them is nothing else than a new law?"
http://lutherantheology.com/uploads/works/walther/LG/lecture-09.html#thesis_five