I agree with the reviewer who said: simply read the first essay ("Culture"; which is a slightly edited version of a famous paper published in 1984), and leave it at that. There are some marvelous insights on the problem of postmodernism and the spectacularization of contemporary capitalism; but also plenty of jargon, meandering, and (not to judge) also lots of engagement with arcane theoretical issues that are way beyond my present ken. The next several chapters look like case studies, and the long (100 page) conclusion can best be left for another decade.
This book was definitely worth the 2-3 days I spent with it -- and Jameson's critical approach to Postmodernism, and his insistence on the political implications of it -- are good to have nailed down. The topic, however, is much, much
better dealt with (imo) by Sadie Plant's The Most Radical Gesture -- whose book is, from sentence to sentence, utterly flawless.