You do realize that Obama only used his veto power twice, and that the veto power IS part of the Constitution in the separation of powers clause. Also, if the number of supporters of the bill in the Legislative Branch is large enough, they can override the president's veto. Thus, Obama has not and cannot overstep his bounds as president using his veto power. Fun fact: FDR, one of our greatest presidents, actually used his veto power 635 times, over 300 times the number Obama has used.So the Legislative Branch rightfully makes laws that the Executive Branch can then choose to ignore? I thought Obama swore to uphold the Constitution ... or was that an ad lib placed into the audio on that day?
A US President who chooses to simply ignore laws that he doesn't like! Maybe he'll perform a work stoppage like his Wisconsin buddies did and we won't have to worry about Obama up until the 2012 elections.
The reason for the government inefficiencies is thus the partisan divisions in Congress and their reluctance to compromise, resulting in filibustering and outright rejection of bills. Working together would be much more productive than working against one another as your comment perfectly illustrates.