Opposed to Obamacare, Divided About Obamacare

The main problem is that Republicans are a diverse bunch who opposed Obamacare for a variety of reasons. Those most focused on shrinking the size and reach of the federal government thought Washington was already too involved in health care and should pull back, not expand its role or raise taxes to pay for new health spending. Those preoccupied with personal freedom balked at being required to buy health insurance. Others thought the widespread use of insurance to fund health care was already driving health spending too high and objected to further expanding health insurance. Still, others thought broadening health coverage was a desirable goal, but that the subsidies and regulations that Obamacare used to accomplish this goal were poorly designed and transferred too much power from the states to Washington. All of these Republicans could agree on trashing Obamacare, but they did not have a common intellectual basis for designing a replacement and they still don’t. 
http://www.realclearhealth.com/articles/2017/02/09/why_is_it_so_hard_for_republicans_to_replace_obamacare_110432.html