Revan in her frankness is likeable, but every time something borders on emotional it is met with sarcasm, harsh cynicism, or plain apathy. I fully understand that this is true to the character, but the things that she fights for are simply understood to have significance; the depth of that significance is often blown over.

Carth is perfect in every way, and that isn't true to his character at all. You can claim that he's changed since KotOR, but he doesn't remotely resemble that person. In the previous parts he blew over advances of a person from his past (this scene only proved to establish their faith in one another, which was apparent anyway. The temptation itself was added to test the faith, but without it the story would have been fine), looked past Malak's return as if it was an everyday occurrence, immediately forgave Revan's murder of her father (I can believe this one), only seemed mildly troubled at the existence of a step-daughter, and took a ridiculous summary of their painful history in stride. She takes shots at his murdered wife and he doesn't blink an eye. You can call this a testament to his ability to get over the past; I call this a character added to be disgustingly perfect in order to balance with a character that is so woefully flawed. In the end, the parts do not form a balanced whole and neither character is sympathetic in any way.