Just a rant full of spoilers, don't read it if you..oh well, that ship has sailed.
I agree that Mami is not THE main character, but that there is more to her than the stereotypical senpai.
Urobuchi commented that despite her strength and experience she posesses a certain mental fragility someone with her background naturally should have, as evident by the way she snaps and decides to kill all of them once she learns the awful truth, which almost happens again in Oriko Magica, and by extent in one of the Drama CDs (she doesn't resort to murder in the latter one though).
A lot of her actions are driven by guilt, including the initial wish to remain alone, then to protect the other girls (by extension even from becoming magical girls), and her apartment is completely devoid of any emotion (until the bluray, anyways).
Her entire magical power (the ribbons) goes against the buddhist motif of relinquishing oneself from the attachments of this world, i.e. to "let go" after death, which she was afraid to do, hence her wish.
I would even go so far as to regard her as a deconstruction of the senpai archetype; She is by far the strongest (until Godoka, anyways) and most experienced of the girls, when she fights alone, but she utterly lost it the moment she decided to stray from her path of solitude.
She's not a character made to get the others to "grow", as her fate does the complete opposite, but a character that failed to grow herself, a character that displays that life is not a game, even for magical girls.
My personal favourite was Sayaka though, she was by far the most good-willed, and purest, of the bunch, and just as easily corrupted.
She is impulsive and courageous, almost mocking the hero stereotypes.
On the other side of the spectre she has almost no experience in her life, resulting in the self-impairment she displays, a very realistic problem for people of her age. She cannot muster the courage when needed, and her naivete haunts her until the moment she wished to die, but instead turned into the most horrible thing possible for her. You can literally see her succumb to her depressions, and her fall from grace as a result.
What striked me most about her though was her inevitable (in every time line in which she becomes a magical girl, she will inevitably become a witch or die) transformation in something that can be summarized as a tragic hero (which is mirrored in her appearance; half mermaid, half knight). The runes in her boundary are a desperate cry for attention (They all read "Look at me" "Look at me" "Look at me", in a horribly depressing amount) and the love for music is the only connection that is left to her former self, and her witch card states that no word will ever reach her again.
All in all Puella Magi Madoka Magica is not an anime you can "fastforward" through, it is a work of fiction that needs to be enjoyed in its complete context, in its entire deconstruction progress, and with all its references to classical literature, music and mythology it has.
"Abandon all hope, ye who enter here" - Inscription above the gates of Alteil
Romdeau wrote:I don't have much else to say to you other than you live in your own world if you believe I have active enemies around Alteil besides from Demongod.