Is it correct, that too many uncorrected mistakes during one's shemoneh esrei would make it lose its literal meaning, and therefore invalid and useless. Here, I am even excluding the errors that would make it avodah zara.
At what point does shemoneh esrei would lose its literal meaning? Do only the signatures of brachot have the be intact? Do even entire bodies of brachot have to be intact? Should one use the same standards at the amud reading shemoneh esrei, as one is required to keep when reading the Torah?
What if the shaliach tzibur makes those mistakes?