1) Infidelity I don't mind so much in certain fics; epilogue-compliant ones sometimes need it. But rape I simply can't stand. It's not the rape itself so much as the fact that a lot of authors have rape leading to true love or simply forgiven right away.

2) As you said, sometimes the character death is simply milked for angst and despair, and doesn't fit in with the story. I don't really get why authors would choose to end the fics that way.