Would the following phrase be considered positive or negative?

the nicest thing i can say is that i ca n't remember a single name responsible for it

negative

Would the following phrase be considered positive or negative?

it 's time for an absurd finale of twisted metal , fireballs and revenge

negative

Would the following phrase be considered positive or negative?

as clear and reliable an authority on that

positive

Would the following phrase be considered positive or negative?

a convincing impersonation
positive