there's always heroic leap if you really need to get out of something.
all rares are easy as fuck. just dodge all the bad stuff. stun the creepy stuff (charge, shockwave), e.g. the pandaren whirl.
get second wind for the rares, sit at 35% hp and kill stuff.
the only real creepy stuff are the mantid (or what ever they are called), because they have TWO insta kill abilities, the blade flurry AND the tornadoes hit like trucks in your face.
oh and keep your interrupts ready. some things NEED to be interrupted in order to even think about killing them.
clear area of possible adds. I learned, that most times when I died on rares, it was either some pvp action or some adds I didn't kill before I attempted the rare. Or I didn't pay attention.