How much did you hate Maggie in this movie?

I felt sympathy for her in the end...she truly loved the Tom Arnold character, but her "bill came due" for her wicked past behavior. She knew that she could never make him trust her or see the truth of her love, so she resigned herself to the relationship's end. Her "swan song" performance at the end is heartbreaking.
I predict Maggie will have Streep's stature as an actress twenty years from now.

I liked her in this role, actually my interest become more solid with her performace in this movie

I didn't hate "Maggie" in the film.
She's a descendent character of Dede, played by Christina Ricci in an earlier Roos film, The Opposite of Sex.
However, unlike the opportunistic young woman in that film, Happy Endings does not make Jude the main character.
In digital terms, Jude's the zero, and Dede's the one.

Impressed by Maggie's singing, even if it was the old Billy Joel catalog.
She's just the bee's knees.

gac

I actually found her character interesting. I think out of all the characters she accepts who she is and just lives with what life throws at her. Note her temporary living arrangements never really work out so shes in this constant state of survive-by-the-day routine.

It's like she has so many things that she could concievably be upset about but she shruggs things off because she knows that crying won't change things, and just needs to move on before she lets things get to her.
I think we finally start to see that little characteristic in her near the end when she tells frank she pregnant and she shows some genuine emotion. She took a chance and told him the truth, and it blew back in her face. And again we see her resort back to that ruthless leech we all thought we hated.
It's like a survival technique for her. We don't know much of her past, but I get the feeling she might have had a tough time growing up.

She was very hateful in the beginning but my hatred changed to compassion when she later on realized how messed up she was. Her character remains an enigma.

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I didn't like her at all, and felt no sympathy for her. Why should I? Certainly not because she got pregnant and had an abortion. As far as losing Frank, she sort of had it coming. And I'm not really sure I buy that she really loved him. And I don't necessarily think she changed.

Towards the end of the movie - Lane comments to Frank about Jude saying "She's (Jude) is still fat, though."

I took it to mean that Jude was still pregnant - she never had the abortion - we see Jude getting stopped pulling into the parking lot but we never see anything else. Then, Lane says that Jude is still fat - at this time Jude is probably starting to show.

Mamie (the one that gave up her birth child) said to Jude that the decisions we make are bigger than ourselves - Jude seemed to take this in after being offended by Mamie saying baby - which I found strange because all pregnant women are pregnant with a baby. Was Mamie supposed to say "the something you created when you had unprotected sex with a boy to use him & blackmail him or the something you created when you used sex to make Frank fall in love with you."

I think the reason we see Jude singing at the end - and are not told about her happy ending is because we watched her happy ending in progress: she got pregnant, decided to keep her baby, and because of the baby she changed & will never use anyone anyone again by exploiting their vulnerabilities. We don't need to be told about Jude because we see her from being the one in trouble while talking to Frank on the bed to being told via Lane that she's still fat (because she's still pregnant) - Jude's happy ending was created when she decided to keep her child.

I think that Mamie was trying to tell Jude "look I made mistakes I gave my child up for adoption & I wish I would have had someone in my life tell me that once you get pregnant your life changes forever, you are changed forever regardless if you are prochoice or prolife - once you become pregnant nothing can get rid of that - you will carry this pregnancy in your heart forever regardless of what you do - so please do the right thing - make the right choice."