I'm not sure that AA's 767-200s are really their "flagship" product. I guess they occasionally call it that because those are the planes that do LAX-JFK and SFO-JFK flights.
But they certainly offer a nicer domestic first class product.
First of all, if you're lucky you can find yourself on a 777 on LAX-MIA flights. That's basically an international product. Full horizontal lie-flats in first, nice new lie-flats (kind of diagonal lie-flat seating) in business, with built in on-demand video. Probably the nicest domestic plane I've ever been on, even if it is an international product that just flies one or two domestic routes on its way somewhere else.
More commonly, AA offers a very nice 767-300 on a bunch of routes (my favorite is LAX-BOS, especially with the current triple miles offer). It's got the same diagonal lie-flat seats as the 777, and though it doesn't have a built in personal video screen, flight attendants pass everyone a video player with BOSE headphones. Very cool. Also, it's a super comfortable seat.
On a last note, I actually like the 767-200. Lots of business seating, which means it's often an easy upgrade, and those seats are pretty roomy. It's something that American can call a first class product while keeping a straight face, something I'd challenge them to do with that ultra-crappy 757. As a huge American fan, I feel bad that you had a bad FA experience on that flight... I tend to get much better service on dinner flights, and on morning flights where the crew is fresh. Furthermore, I know it's a bit obnoxious, but on a flight where I feel ignored by the FA, if I want something I won't hesitate to hit the call button. If they're sitting in the galley chatting, I don't feel bad hitting the button to ask for a drink.