Yes, -2 degrees is too much camber for the street. I have built track cars that perform well with under -2 degrees of camber.
Couple things to note....the Macpherson strut front suspension will have very little camber gain as the suspension compresses in a corner, so you usually want a larger static camber setting if you are tracking. A car like a Miata with a double wishbone front suspension can get away will little camber statically, as it gains camber in the corner as the suspension compresses.
Think of camber as setting the contact patch of the tire, caster as the tendency to self align, and toe as the amount the tire scrubs.
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