"a mandate that most individuals get health insurance"
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It is a little more complex.  
i) it was a mandate that working individuals above a certain income get health insurance, OR pay a heavy fine instead.  
ii) "most" is correct but perhaps a little misleading.  For example, in California more than 30% get health care/insurance for free.  They do not have to pay for it and do not get fined.
iii) The health insurance that many buy because they are forced to is next to useless because it only pays 60% and has a huge deductible.  That is all many of those who are paying can afford.  
iv) The people who are getting it for free have problems too.  The repayment schedule is so low that many doctor's will not take them.
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It's a GA mess.