Question

What line from Act III of Hamlet supports the conclusion that Shakespeare is critical of actors?

for in the very torrent, tempest, and—as I may say—whirlwind of passion, you must acquire and beget a temperance, that may give it smoothness
it offends me to the soul to hear a robustious periwig-pated fellow tear a passion to tatters
but let your own discretion be your tutor: suit the action to the word, the word to the action; with this special observance
And let those that play your clowns speak no more than is set down for them

Answer 1

"it offends me to the soul to hear a robustious periwig-pated fellow tear a passion to tatters"

This line (Act III, scene ii) directly criticizes actors who overact—tearing a passion "to tatters"—so it most clearly supports the conclusion that Shakespeare is critical of actors.