The GOP Has Been Bad. But Not as Bad as You Think
Republicans have been dreadful on plenty of fronts -- the quality of their advocacy, the spine they show making arguments and the lack of innovation and malleability in the focus of their policies, to name a very few -- but resistance to Obama's legislative agenda was definitely not one of them. If Republicans had capitulated in the way the average angry populist claims, Obama would not have needed to enact some of the most consequential abuses of executive power since World War II.
Some of this anger is propelled by false expectations and wishful thinking about how government works -- which is to say, when voters don't get what they want they assume the system has failed. On one hand, voters are under the impression that presidents should be able to craft law and policy and make everything great again; and on the other, they are angered about the ineffectiveness of the legislative branch. It all depends on which of these corresponds with their own political affiliation.
As far as expectations go, Republicans deserve blame for making promises they couldn't possibly fulfill -- including the notion that they could repeal Obamacare. Then again, overpromising is not exactly a new political trend. And it's not as if voters flock to candidates who tell them unvarnished facts about this cruel world of ours.