It was because the POTUS and a California Senator who wrote it and shoved it down our throats without the permission of the American Voters and lied about to get passed by the US Congress. It contained many, many secretive bills that gave Obama his unconstitutional powers that he is using now against the US so it was not just the ACA or Obamacare but the combination of many illegal things, and the start of the huge riff between the American people and DC that now exists.
What is the real, underlying reason that hardline conservatives in America dislike the Affordable Care Act?
Tax
Guess where hardline conservatives live? Usually states that refuse to expand medicare and the general populace suffer for it.
While your deductibles and surface level "at-a-glance" numbers you see
may have gone up, IN GENERAL, your new plan is a stronger/better
worded policy as a whole, most notably being higher limits in the event
of a catastrophic loss.