I hated it in university and hate it until this very moment. I get what this language is doing and why it is great for special usecases. But I can absolutly can not read code written in Prolog. Staring at 3 lines of code and not knowing what the hell it does, gives me nightmares till today.
You can write a quicksort in a few lines. You can traverse over a tree very easily. But understanding these few lines takes me more time than writing it in C, Java, PHP etc.. But I guess it is all training...