Well, thank you for sharing! I am actually familiar with the Catholic teaching as I've studied it and I understand that what you're saying is not from malice, but rather out of love, so thank you
However, on the point of succession of authority I have to respectfully disagree - I won't get into it too much as it's really a topic in and of itself. In short, Lutherans hold that the sacraments can be administered by the church; suffice to say - the sacraments rest God's own promise, which again is apprehended through faith.
Lutherans (in the orthodox sense) hold to the Book of Concord, which are the Lutheran Confessions. It's available online at:
www.bookofconcord.org
It has a pretty comprehensive definition on the sacraments, but I can save you the hassle in searching for them and provide some quick references, though please do feel free to check it out. One thing you may find interesting is the Augsburg Confession, which offers the Lutheran teaching, the Roman Catholic Confutation, and again the Lutheran Defense; here you can clearly and systematically compare our doctrines.
Anyway, here are some Lutheran confessions specifically on the Eucharist:
"It is the true body and blood of our Lord Jesus Christ, under the bread and wine, for us Christians to eat and to drink, instituted by Christ Himself."
"Of the Supper of the Lord they (Lutheran Church) teach that the Body and Blood of Christ are truly present, and are distributed to those who eat the Supper of the Lord; and they reject those that teach otherwise."
"Of the Use of the Sacraments they (Lutheran Church) teach that the Sacraments were ordained, not only to be marks of profession among men, but rather to be signs and testimonies of the will of God toward us, instituted to awaken and confirm faith in those who use them. Wherefore we must so use the Sacraments that faith be added to believe the promises which are offered and set forth through the Sacraments.
They (Lutheran Church) therefore condemn those who teach that the Sacraments justify by the outward act, and who do not teach that, in the use of the Sacraments, faith which believes that sins are forgiven, is required."
I hope this provides some insight into the Lutheran confession on Eucharist; that we indeed believe in the Real Presence, that it is the true body and blood of Christ graciously given to us, and that it was commanded and instituted by none other than our Lord Jesus Christ - God in flesh for us.
Very lastly, I wanted to show you a Catholic response to the Augsburg Confession: Dr. Johann Eck (a prominent Roman Catholic theologian of his day) was asked
"Can you refute this (Lutheran) doctrine?" Eck answered:
"With the Fathers I can, but not with the Scriptures."
Cardinal Lorenzo Campeggio also said:
"Personally I could admit this (Lutheran) doctrine, but officially we must oppose it."
Now, with caution, I'm not trying to oversell Lutheran doctrine, but I hope to illustrate that the Lutheran teaching, especially on the sacraments, are orthodox and firmly rooted in Scripture. Practically speaking for any Catholic, I wouldn't lump Lutherans in with those who hold to Zwinglian ideas of memorialism, as Lutherans reject Calvin and Zwingli (though there is much overlap in other reformed theology, but not on the sacraments. Here Lutherans and Anglicans are probably the closest to Catholics and Eastern Orthodox).
Sorry for the lengthy post, but I hope this clarifies some popular misconceptions, and feel free to disagree!