What a gang of negative nay-sayers around here!
Glenn Gould is the greatest and most important interpreter of Bach that we've had in the last hundred years, bar none.
Listening to him, intensely and repeatedly, will not hurt you.
Anthony Newman in his very under-appreciated book on Bach and the Baroque
("Bach and the Baroque: European Source Materials from the Baroque and Early Classical Periods With Special Emphais on the Music of J.S. Bach" at Amazon.com)
weighs in against what he calls "urtext performances," a middle-of-the-road approach which respectfully homogenizes down all extremes of possible interpretation, leading to a lukewarm result, medium tempos, medium dynamic range, and boring mediocre expressiveness as a result.
I find Tureck, Hewitt and others to be squarely in that boring "respectful" category, and quite a few of the other pianists not mentioned here as well. Schiff is okay but he doesn't light my fire at all in this music.
Gould is always provocative, brilliant, clear, technically immaculate, rhythmically incisive and his approach to Bach articulation set a whole new standard for pianists playing the composer forever after.
What's wrong with any of that!??
Finally, if you want to hear the peak of Gould's Bach interpretations, listen to his rare CD of a live performance at Salzburg in 1959 of the Goldberg Variations, the result of his experiences performing this music on stage, around the world, for several years.
His public performance history matured his take on the piece in astonishing ways. Also included on the disk is a partial (tragically flawed in its recording) version of the Bach Sinfonias from Moscow, with playing of staggering beauty and focus.
(Amazon: "Glenn Gould Live in Salzburg & Moscow: Bach: Goldberg Variations, BWV 988 (from Salzburg Festival, 1959); Three-Part Inventions, BWV 788-801 (from Moscow, 1957)"
Don't let anyone keep you away from these treasures -
Teachers should always be filtered through your own perceptions, responses, and deepest musical impulses. They are never right in every case -
good luck,
Claude
PS - The Murray Perahia Goldbergs are also beautifully played if you need another perspective