Oh Dear!
No the 737NG is not Boeing's best effort. Given the strictures and constraints over what had to be done to which and in what constraints with how much cash when you look at its jiggles, coggles and kinks (as opposed to cranks) the wing tells its story loud and clear. Voltaire's Dr Pangloss argued that everything is for the best in this best of all possible worlds. He never went so far as to suggest that if anything exists then because it exists it must be perfect. Or are we losing critical faculty? The 737NG is more Bogan than Boeing, but "She'll too, she'll too, she might have been a poy". Nothing wrong with her that a healthy discount and ready delivery date can't cure. Now which company do I work for again?