Could you point me to any commentary you've read that suggests poor people are unhappy? My impression from various forums is that people with pre-existing conditions who are not covered by group plans are thrilled because their net costs are being cut in half (or more).
The only not-too-positive views I've read are from people who aren't happy that they're not eligible for subsidies because they don't make the 138% of poverty income threshold because their state hasn't signed up for the Medicaid expansion (which would enroll any household making up to 133% of the poverty threshold in Medicaid aka zero-cost-to-the-user health insurance without any asset test). Households under the 138% of poverty income thresholds whose states don't sign up for the Medicaid expansion get hit by a double whammy. Premiums are skyrocketing because of Obamacare, but they're not eligible for subsidies. They don't have to pay the fine, but they're no better off than they used to be, in the sense that insurance is even further out of reach due to premium hikes.