is the best answer I've seen all thread, of the original three I'm gonna give best recognition to Marge.
Dexter's Mom is ...well, she's a good homemaker but part of the entire point of Dexter's lab was how completely out of touch his parents were with their children as well as a basic joke that your kids can be much smarter than you think.
Linda means well, she really does. Ever the eternal optimist, trying to do whats best of her kids but this blinds her to actually disciplining her kids and we've seen the damage she's done trying to bond with Louise or worse, make her conform. Also she's a bit of an enabler, but moreso with her dumb sister than her kids at least.
Marge is the only one who not only legitimately loves her kids but of the three understands them the most. Even usually with Zombie Simpsons this is still the case. She also is able to unconditionally love Bart (apart from that one Christmas episode in which she still ultimately managed to look past after Bart tried to owe up to his mistakes,) when almost no one else is willing to. Homer certainly doesn't care for his kids properly (even if he sometimes tries to.) Marge's efforts are Herculean and while it's cost her, she still manages to keep the family going.