I get your viewpoints. While I do think Madoka Magica is an excellent anime even when marathoned and/or watched alone, I will admit that much of its greatness is helped along by watching it "Live" on a week-by-week basis, with regular discussions with other anime fans feeding into hype momentum and series speculations.
The same is definitely true of Penguindrum, I think.
I'll admit that I'm a bit of a sucker for characters that will go above and beyond with unflinching dedication for that one special person in their life - Which is probably why I liked Madoka a lot, as I saw a lot of that with both Homura (for Madoka) and Sayaka (for Kamijo).
I can see how someone less fond of this might perceive it as unrealistic, and/or hard to swallow. That being said, young love really can make teenagers/young adults do seemingly crazy things... though Homura did push it admittedly.
Like yourself, I have to see her actions has at least partially reflecting a strong lesbian attraction for Madoka, because otherwise it is a bit hard to swallow, yeah.
As for Nanoha, I'm not a lolicon either, I just love Nanoha a lot for her personality and style. I've always been a big Superman fan, so I love those magical girls that embody a lot of his characteristics, only within the form of a cute mote girl, lol.
Anyway, thanks for your answer!