[@Cassowarysaur]
[hider=Spoilers]Whether something graphic should be shown uncensored or simply hinted at is a subjective matter, but I think the route they went with Mami's death was fine; showing just enough to make your mind fill in the rest, the same philosophy of horror that the original Texas Chainsaw Massacre runs on (Fun fact: It was a lot more explicit in the manga). Schoolgirls can be interesting characters too when properly written; I fail to see the point of that comment. There wasn't meant to be tension actually; the viewer was supposed to assume Mami would win that fight. 
As a counterpoint to not enough character development, there was a similar character in NGE, Tōji Suzuhara, who becomes a pilot for a very short time before disappearing completely. There's also the fact that as a viewer you were not supposed to know of the darker nature of the show before watching it, so the death doesn't come as much of a surprise as it originally did. It's similar to how NGE started with Shinji deciding to pilot the Eva and confronting the first Angel with victory assumed by the viewer, only to subvert that expectation.

All in all, if this episode hasn't convinced you yet, then I suppose the rest won't, since this is about as graphic as it's going to get.[/hider]