The US state department said Assad's speech lacked substance and would be a disappointment to those calling for change in nearly two weeks of demonstrations, some of which have been violently crushed by Syrian security forces.
"Ultimately, it's going to be the Syrian people who judge what they heard today, and whether or not President Assad demonstrated positive movement forward in meeting their aspirations and hearing their call for political and economic and social reform," Mark Toner, the department spokesman, said.
"We expect they are going to be disappointed," he said.
"We feel the speech fell short with respects to the kinds of reforms that the Syrian people demanded, and what President Assad's own advisers suggested was coming."
"It's far too easy to look for conspiracy theories, [rather than] respond in a meaningful way to the call for reform," he said. "The emergency law is incompatible with the rights of citizens, who are seeking to exercise their universal aspirations and rights."
Revoking emergency rule "would be the kind of step that would indicate reform," Toner said.
He added: "It's clear to us that [the speech] didn't really have much substance to it, and didn't talk about specific reforms, as was suggested in the run-up to the speech."