Other than the boarding order, how is this different than any other 737 flight you have been on? I fly exclusively on Alaska airlines and it's the same thing only they call row numbers. There are still idiots on every flight who think they own the aisle. Oh, and depending on the gate person calling the flight, it'll load front to back or back to front.
Seriously...Go book a flight on American, pick a 737 or MD-80. Then come back here and try to look me in the keyboard (with a straight face) and tell me that there isn't a lot more legroom.