An American airline's lounge that doesn't let its business class ticket holders in, and require additional membership? It's not even a decent lounge and for a ticket that charges hundreds over a similarly sized (4 per row instead of 3?) it is simply ridiculous. If I wasn't a loyal flier of AA's affiliated partners I wouldn't even have chosen AA.
On the other hand, the British airways lounge (partner of AA) in this airport is amazing, very good buffet and service.