What advantages and disadvantages did the Americans have when compared to the British in 1776?

The major disadvantage that the colonists had going in to
the Revolution was that they had no military to match that of Great Britain.  Britain's
was the strongest military in the world at that point.  Britain had a professional army
and a powerful navy.  The colonists had militias and no navy whatsoever.  They also had
no support from any powerful countries in the rest of the
world.

The major advantage that the Americans had was the
fact that they would have to do less to actually win the Revolutionary War than the
British would.  The British would have had to conquer and pacify the whole of the 13
colonies.  They would have to make sure that the colonists actually wanted to be done
fighting and to reconcile with the British.  By contrast, "all" the Americans had to do
was to hold out long enough to frustrate the British into quitting.  The Americans at
least had a good chance at this because they were much more motivated than the British. 
The British soldiers were not fighting for any personal goals while the Americans were. 
The British public and indeed the government were not truly united behind the war.  In
this way, it was likely from a political standpoint that the British would tire of the
war before the Americans would.

So, the major issue was
this: would the British advantage in military force be able to overwhelm the colonies
before the American political and motivational advantage took over and allowed the
Americans to win when the British simply gave up on the war.