Weakest? What kind of schoolyard talk is that? 
History (and people with common sense) judges presidents by their accomplishments, not by cheap insults made by the opposition. 
Check the markets, the unemployment, the dollar, the deficit, the price of gas, and the esteem in which the US is held by other countries in the world and you'll find on every important measure Obama has done a great job for America. I mean, unless you hate strong markets, cheap gas, reduced unemployment, universal health care, and enjoying the respect of the global community. 
I guess you voted Trump, and would prefer to go back to the "good old days' of GWB's record deficit, two disastrous wars, two stock market crashes, and the worst unemployment and economic conditions seen for more than a generation. Ya, that's what a strong president does!?