Were the taxes reasonable? It depends. The colonists by 1763, post-Seven Years' War, were much different from the colonists that first settled Jamestown and Virginia, Massachusetts, etc. I think the problem with reasonable taxation came down to the fact that the American colonists viewed themselves as just that; Americans. Not British colonists. A lot of the taxes that were being imposed by the British parliament were to try and help the failing East India Company in Asia, which was having troubles finding funds to compete with other competitors. So is it reasonable to help them? Well, it is if you view yourself as British and this as a goal to help the overall state of the British monarchy. Now, it's pretty widely accepted that Nationalism is a pretty modern phenomenon, appearing circa 1848, a rather turbulent year in European History. So it's most probable the Americans did not care about Britain's Far East enterprises.

Could the common man of the time live comfortably with these taxes? I'd say yes. A lot of Americans were well to do because of years of salutary neglect on their lands. Paying taxes to the actual Monarchy was almost non-existent; the only Act being passed prior to the Proclamation of 1763 that meant to effect the colonies being the Navigation Act 1651, which forced American colonists to buy products only from the English, Scottish, or Welsh. But, Historian Robert Thomas argues the actual effect on personal American income was minimal; the cost being 4$ for every 1,000$ earned.

In conclusion, the majority of these taxes effected the rich plantation owning, or merchant, class of the American colonists. A tax on sugar wouldn't really matter to the average American, because sugar was already expensive anyway, and they would not have to worry about customs inspections. The colonists demanded that they be allowed to keep their individual self-made congresses inside their colonies and allow those forms of governments to, well, govern. A large "final straw" with Britain was the Coercive Acts passed in 1774, passed as a way to punish Massachusetts, the hotbed of resentment among colonists, for the Boston Tea Party. The Act took away Massachusetts' right to self-governance and was hoping to make an example of the colony for the others, the British hoping that Massachusetts was the only colony with intense rebellious action. I think the average American was more upset by such acts as the Proclamation of 1763, which banned colonists from being allowed to migrate past the Appalachian Mountains, the Quebec Act, which enlarged the territory of Quebec, a catholic province, at the detest of the zealous protestant New Englanders, and the Quartering Acts, forcing Americans to house British troops.