I work in tourism in Argentina. The high season for tourism doesn't really get going until October/November and runs through March, so even though it's up 18% so far this year the overall number is relatively low compared to the number of tourists during the high season which is probably why you don't see droves of Americans currently. Hopefully the growth continues during the high season!
The government is starting a promotion to discount the IVA tax for hotels for foreigners and eliminating the reciprocity fee helps. The major issue I hear from tourists is the surprisingly high cost of the city. Another personal opinion is that the local tourism industry is quite stagnant in its offerings and hasn't kept up with international travel trends. Mega tango shows, bus tours, mediocre parrillas, non-descript hotels, unpersonalized and bad service are the norm. Big opportunity if you are good at marketing a tourism business.
The lack of internal budget flights is always a big shocker for my friends who plan to visit multiple sights and then get spooked by the price and the fact they can´t fly from one major attraction to another without passing through BsAs again in the process. Just hand holding one of them at the moment so your comments on the stagnant offerings feels very real...