Memorizing and meditating on Scripture is not the same as reciting canned prayers.
A prayer written by men does not carry the weight of authority or inspiration as God breathed Scripture.
The Our Father was written by a man and is God breathed Scripture. There is nothing wrong with it. There is everything right with it. Memorize it, meditate on it, and make it your prayer without ceasing.
After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name. Thy kingdom come, Thy will be done in earth, as it is in heaven. Give us this day our daily bread. And forgive us our debts, as we forgive our debtors. And lead us not into temptation, but deliver us from evil: For thine is the kingdom, and the power, and the glory, for ever. Amen.
And it came to pass, that, as he was praying in a certain place, when he ceased, one of his disciples said unto him, Lord, teach us to pray, as John also taught his disciples. And he said unto them, When ye pray, say, Our Father which art in heaven, Hallowed be thy name. Thy kingdom come. Thy will be done, as in heaven, so in earth. Give us day by day our daily bread. And forgive us our sins; for we also forgive every one that is indebted to us. And lead us not into temptation; but deliver us from evil.