The ruling on praying behind one who does not recite well

Question:
May Allah reward you with good, and may He do you good. His last question is: Is my prayer valid behind an imam whose method of reciting the Qur'an I dislike?

Answer:
If this imam makes a mistake that changes the meaning, then your prayer behind him is not valid, just as if he read "al-'alamin" with a kasrah, saying "Alhamdulillah Rabb al-'alamin," would that not change the meaning?
As for if this imam does not make a mistake that changes the meaning, then your prayer behind him is valid, even if you think his recitation is not perfect and has notes on it, as long as he does not make a mistake that changes the meaning in al-Fatihah, in Surat al-Fatihah, which is a pillar of the prayer. As for mistakes in other surahs, they do not harm, though it is better that he learns and corrects his recitation. What you should do is teach this imam, alert him to the errors, and teach him the correct way to recite the Qur'an, and be kind in doing so. Yes. May Allah reward you with good, and may He do you good.