I'm pretty sure mine were some of the criticism you heard ;-) My critique largely focused on the imperialist attitude of the project: Negroponte described the project with hope that it would be as impactful as the "Niña, the Pinta, and the Santa Maria" without any sense of recognition of th negative impact of those ships. When the first technical bring up touted OLPC developers running Doom on it, it was a reminder of how, no matter how much we claim technology is absent of agenda, it is many ways a reflection of the values of the developers.