app_eng,
My situation is very similar wrt to 'Hey Ram' songs except that I consider 'isayil thodangudhamma' a top class song which can be ranked along with Raja's best. Other songs have not made a major impact I would say. As you said, it could be that Raja had to force fit the song into something which was already picturized and probably did not have much leeway. Compared to the other Raja-KH albums like Guna and Virumandi, I listen to 'Hey Ram' less often and that too I listen mainly to 'isayil'.