a really lengthy and detailed review. i almost fully agree with you on the series, but i liked the ova's(even the seisouhen) way more than the series because of their seriousness. i think the first four ova's are truly a masterpiece - i have yet to see anything better.
i haven't read the manga yet(only up to vol.8) but i'd suggest watching only the first four ova's before the series(thats what i did).