I'm sure this will be updated later on, but so far here's the quicklist of best / worst
Best of Buenos Aires so far...
1. Nightlife
2. Hostels - meeting people from other cities in Argentina & all over the world
3. People - watching
4. The Argentine diet - as mentioned in post #2
5. Soccer
6. Antibiotics over-the-counter
7. Coffee anywhere, anytime
8. Tango culture
9. Revival of the mullet
10. Winter in July
Worst of Buenos Aires so far...
1. Revival of the mullet
2. People - crowds
3. Hostels - no TP, broken lights, 10-bed-rooms...
4. Smokers everywhere
5. Winter in July