Perloff quoted from Wittgenstein saying that poem should never give information, but contain it. Vendler believes that poetry is for pleasure and that its sense and sound are akin to a melodic singer who touches the reader. Of course this is grossly paraphrased from my rather hastily taken notes. You can read Stephen Burt's paper in this issue of Jacket. It means that poets are not really thinking critically about the state of poetry, politics, and the world, but rather are keeping tallies on prize money and whose book was published by what university press.
Every sheet looks just like every other sheet.
This kind of attack falls flat when the distinctions between who is mainstream and who is experimental are blurred. You can read Michael Scharf's paper in this issue of Jacket. Of course, it all comes down to the marketplace in which we are all consumed. MFA's are easy targets because they do believe in a marketplace and saturate bookstores with free-form doggerel, get prize money, colony recognition, etc. After all, EPs have been known to saturate the underground airwaves with their own kind of derivative gibberish.