Not so sure about that....I prefer sitting at one of the cafes in the terminal and watching the senoritas walk by.

Amex Lounge here.....sorry wrong link. Amex and RCC lounges here.
Admirals Club (BA lounge) here.

None nowhere near T5 standard I'm afraid although the Admirals Club is okay to pass the time in. I haven't been in the IB lounge but from what I've heard that's no great shakes either.
Trouble with Ezeiza is they have tried to put a quart into a pint pot. Duty free takes up most of the flippin' departure area. Get there at a busy time and it can be crowded. The lounges are worse at night when the N American flights leave.