I'm currently on season 11 of ER and I have not been a fan of this relationship at all. I was a big fan of Linda Cardellini in Freaks and Geeks, and Dead to Me but her character as Sam is a tough watch.
I know what happens to Sam and Luka in the end but still, watching their relationship unfold is rough. Luka just told Sam he loved her and this was one of the most unromantic scenes I've seen out of the whole show. They're both good looking and good actors individually but wow, just no chemistry between them at all.