Me too! Mainly because I heart Luke so much. But I really liked how after they broke up, Luke accepted that she was with Ryan and even tried to help him out with the Oliver situation. Also, after the whole Julie incident I do like that Marissa forgave him after the car accident.
It would have been interesting to see what might have happened if Luke had come back. Although their relationship was not set up to last on the show, I did get the impression they genuinely cared about each other (even if they occasionally had a funny way of showing it
).