I have flown in and out of EZE a handful of times in the last couple of years as I have family in Argentina and cannot remember any problems. Ok there were horrible queues once as I was departing and not a lot of places for sitting down the cafes are getting expensive but other than that I'd say it's good. I have flown Iberia and TAM so not sure if that's part of the equation. I would agree that Tierra Leon is good for transport to and from the airport but if there's two or more adults you get a taxi for the same price. (Tierra Leon don't charge for two year olds and indeed free transfer from where they stop in the city to Retiro from where you can catch a long distance bus- and these are good! Can get one leaving a few hrs or sooner after you get there for a decent price!) In fact long distance coach travel all over South America is good in my experience but that belongs under a different topic obviously.