Indira A.R. Lakshmanan has an article entitled Freed detainees cite rewards, beatings, and the story does indeed speak of some unnamed persecution and beatings, but

nearly all of the former detainees enthusiastically praised the conditions at Guantanamo and expressed little bitterness about losing a year of their lives in captivity, saying they were treated better there than in three days in squalid cells in Kabul. None complained of torture during questioning or coerced confessions....''The conditions were even better than our homes. We were given three meals a day -- eggs in the morning and meat twice a day; facilities to wash, and if we didn't wash, they'd wash us; and there was even entertainment with video games,'' said Sirajuddin, 24, a taxi driver from Kandahar, the birthplace of the Taliban.

(link via Jeff Jarvis via Iain Murray). Marc Kaufman and April Witt, Returning Afghans Talk of Guantanamo, are more negative.