No--the Declaration of Independence only represented the opinions of the Patriots.
The Declaration of Independence provides the Patriots version of how the American-British relationship was working. It declares their opinion of the King, taxation, and their lack of representation.
The Declaration of Independence was written to first express the grievances of the Patriots toward the King, George III. Though George responded, the responses were also biased and only represented the views of the King toward those rebelling. The actions of the Patriots didn't even represent all of the colonists. It was truly a slanted document representing northern colonists who were educated and often at least a middle class standing.
The Declaration of Independence was not "objective and unbiased," because it strongly represented the position of the colonists over against the British.
The fact that the Declaration had a strong position favoring independence and against the British government doesn't mean that Thomas Jefferson, in authoring it, did not try to include some points of fact to support the position the colonies were asserting. Jefferson provided a list of "facts to be submitted to a candid world" to demonstrate that the British king had been seeking to establish "an absolute Tyranny over these States" (the colonial states which were declaring their independence).
Jefferson's list included items such as:
These and additional items listed in the Declaration were meant to support the colonies' position that tyranny was standard operating procedure by the British monarchy, and therefore revolution was justified.
