I've read the decision, but not all the details. From that alone, I see this as a mixed victory, but a victory. To wit:
The Good:
"The Second Amendment protects an individual right to possess a
firearm unconnected with service in a militia, and to use that arm for
traditionally lawful purposes, such as self-defense within the home."
This is clearly very important, and it stated right up front. First sentence in "held." It should stand up against a lot of testing.
"The “militia” comprised all males physically
capable of acting in concert for the common defense. The Antifederalists
feared that the Federal Government would disarm the people in
order to disable this citizens’ militia, enabling a politicized standing
army or a select militia to rule. The response was to deny Congress
power to abridge the ancient right of individuals to keep and bear
arms, so that the ideal of a citizens’ militia would be preserved."
Possibly my favorite part. Should be self-explanatory to all here.
The Bad:
"The Court’s opinion should not be taken to cast
doubt on longstanding prohibitions on the possession of firearms by
felons and the mentally ill, or laws forbidding the carrying of firearms
in sensitive places such as schools and government buildings, or
laws imposing conditions and qualifications on the commercial sale of
arms."
I do not like the last part of this. Arguably "sensitive" places are those where firearm carry is most needed, especially schools, churches, and other places where large numbers of people can be expected to be unarmed, en masse.
The UGLY:
"Miller’s holding that the sorts of weapons protected are those
“in common use at the time” finds support in the historical tradition
of prohibiting the carrying of dangerous and unusual weapons."
This really bothers me. If a weapon isn't "dangerous" what the hell use is it? As for unusual, again, WTH? Sounds like they're angling to preserve/extend cosmetic bans like AWs, and Miller was one of the largest travesties ever perpetrated on the people. Wish they'd overturn it, but, now, it's reinforced in this opinion.
I'm sure I'll be able to say a lot more when I've read it all, but for me this is definitely a mixed victory. But, still, a victory.