Oooh, see now, I'm going to be a bit controversial. It's Saturday, the weather is miserable and I'm bored.
Many other genres have tropes, and they don't seem to get as hung up about them. In fact, a trope can be used by the author to bring the reader along quickly. So, eg, I have been known to read the odd chick lit from time to time.
and in that genre when the nice chap turns up and gets turned down by the girl, I don't go, oh here we go again, I go, well let's see what you do with this one... if you can buy me in with the characters, I'll stay with you and see what you do. *
So, some of the tropes mentioned here - dad is the evil overload. Grand, I'm halfway to knowing what type of book it is, and know I've liked such things in the past. Get me engrossed and I'll probably curl up nice and tight with it. Aliens have been discovered, but vanished, probably to jump on our hero's head with their acidic blood. Coool, who doesn't like a nice alien story. But make me care that they're going to jump on him/her. Quest, that's fine. They can even traipse over to Mordor if they want, and provided I like the characters and what's happening, I'd read it. (I'd argue it's almost certainly going to be better than the first time it happened...)
What I don't like is deriative stuff (which a trope doesn't have to be, it's only derivative if you do the same thing with it, in the same way, with the same language), cardboard characters, flat dialogue, slow plot.
But, if there's a trope in there, it won't stop me reading. It actually might make me feel quite comfy.
*I feel I should mention, though, that I hate the trope of the gang coming together before the quest and them fitting into the prescribed roles.