I must have been reading a different guide to your last reviewer! We came back recently from four weeks travelling in Buenos Aires and the south. I've done a lot of independent travelling in South America (almost every country), and I can honestly say this is one of the best guides I've come across. It's enthusiastic and amazingly well-researched, and I found it objective and honest. We always got the impression that the authors were trying to depict the real, modern Argentina -- so much so that several English-speaking Argentinians we showed it to asked us where they could buy a copy. It definitely doesn't repeat the mulch some tourist offices spew out, and we always felt we had a good idea of when the tourist hype exceeds reality: we'd heard a lot about the Welsh community in Patagonia before we went, but this guidebook was the first thing we'd read that actually gave us a realistic expectation of what to expect. My wife and I enjoyed the treks (AMAzing scenery).... If I've got a criticism, I'd say it could do with a few more maps and we came across one or two typos, but, to be honest, I'd ditch my rucksac before I ditched this. Well done!
NB. If you haven't been to Argentina, it must be one of the most spectacular scenaries around especially the Patagonia. Perito Moreno is a MUST.