Aldrich, Richard J. "Intelligence" in Williams, Paul D. Security Studies: an Introduction. p. 240.

Pessimistic
Richard Betts, 2007
Policy-makers should simply revise their expectations downwards, attributing current disappointment to unrealistic demands. Sees intelligence as ‘tragic’
Methodological
Robert Jervis, 2010
Too much has been expected of intelligence and partly for this reason he argues that pre-emption is weak doctrine. Good political science methods would help analysts avoid some of their more lamentable errors.
Optimistic
Amy Zegart, 2007
Meaningful reform is possible and has attributed recent difficulties to a kind of institutional arteriosclerosis that obstructs substantial change.
Domestic
Gregory Treverton, 2011
Optimistic about structural change, but points out the greatest challenge lie in the controversial area of domestic intelligence.
Iconoclastic
Dana Priest and Bill Arkin, 2011
Argue that the expansion of intelligence and security agencies has resulted in a sprawling and ineffective system that is both unaccountable and unsustainable.