Lol, naivete can be funny.
Sure, they can't outright deny you coverage, but what stops them from making your coverage so expensive you can't afford the deductibles? The answer is, "not a damn thing."
Which is why it's so great that the ACA has rate controls to prevent this kind of thing from happening, and mandates that everybody get insurance, so the many low-risk insured create a pool which makes it possible to cover the high-risk population in an affordable way.
You don't really believe that, do you? There are already tons of reports rolling in of people being denied treatments, being told that the cost of a procedure wouldn't go towards their deductible, and finding out that their $150/mo insurance program has a $25,000 deductible attached to it.
A pastor in Iowa, who is covered under ObamaCare, decried “there’s no compassion in the Affordable Care Act,” after he was told just minutes before receiving life-saving chemo that his treatments would not be covered. The pastor’s family has since emptied their savings account and are now $50,000 in debt.
A February 4 Los Angeles Times article detailed the story of California resident Danielle Nelson who was promised by Anthem Blue cross that her oncologists would be covered in her new policy. Diagnosed with non-Hogkins lymphoma last year, a lump was found near her jaw in January. But when she went to her oncologist’s office, the Times reported she “promptly encountered a bright orange sign saying that Covered California plans are not accepted.” Nelson told the Times: “I’m a complete fan of the Affordable Care Act, but now I can’t sleep at night, I can’t imagine this is how President Obama wanted it to happen.”
The Affordable Care Act is turning out to be less than affordable for some consumers.
That’s because many of the plans carry huge deductibles, creating potential financial problems for middle-class consumers. Some “bronze”-level plans, the lowest level of coverage, carry deductibles as high as $12,700 per year for a family of four... The average individual deductible for a bronze plan is a whopping $5,081 per year, according to research provided to CBS MoneyWatch from HealthPocket, a technology company that ranks health care plans.
What’s worse, that represents an increase of 40 percent from the average deductible for an individually purchased plan before the federal health care overhaul, according to The Wall Street Journal.
... and these are just the tip of the iceberg. Things will get worse as the delayed provisions start to kick in.
That said, I don't think the concept of single-payer healthcare is a bad one; however I do not believe the current implementation is an effective system that's not designed to bilk average Americans out of money for the benefit of insurance execs and the Congresscritters who love them.