Did the Articles of Confederation make the government strong or weak?
It created a formal government, which is the first step.
Really, too many definitions are embedded here. Do you mean "strong" in terms of the government power, its stability or flexibility?
A guiding principle of the Articles was to preserve the independence and sovereignty of the states. As a concept, that is very good, but you could say that it weakened the "Federal" government power.
But, without it, the States might never have agreed to a "Union", in which case they would have remained independent, and there would be no Federal Government to discuss.