This is very simple.
For those who listen and think non Jewish music is acceptable – Matisyahu will always be ok
For those who do not listen to non Jewish music and want a Jewish Ta’am to their music – Matisyahu will never be ok
Nothing has changed, this is not about whether he is wearing a yarmulka or not. His music has no Jewish feeling to it just as so many other “jewish” productions today.
Hatzlacha