Do you know the source of the 752's? No complaints I take it when AA were planning to use 752s between Newcastle and New York.
The basic product that you refer to is the same as that offered by American, Delta, Continental et al. Meals may be included pn their flights but drinks have to be paid for and the seat pitch is the same. GSM's '757s will seat 189 passengers (167 economy & 22 Business) which is exactly the same configuration that American use on their 757s. New York is a big enough market to stand alone without needing interline traffic.