philosophy class

Today in philosophy we talked about some of the most difficult subjects i have ever had to discuss. Has anyone ever taken a class where they have no idea what they're talking about in the discussion, even when you do the studying and the reading before class? I honestly have done readings for classes and been able to walk in and particapate in an active discussion. I have never taken a class like this befre in my life, and i find that its pretty interesting. Today we talked about why people act the way they do, a topic and question that i think could take years to explain, let alone one two hour class once a week. Some of the early philosophers seem to use language that you need some type of advanced degree to understand. trying to read this seems somewhat impossible to me, but in a way i can understand because its my first philosophy class. All that aside, what i find most difficult is when we take one or two sentences from someone like Hobbes or Rousseau, and can literally discuss these two sentences for an hour. What i like about the class is that unless youre completely off subject, philosophy seems to be based on many opinions, and you can pretty much follow who's ideas you agree with as long as you back it up with some information from the text. At first i wasnt sure about the class, but now a few weeks into the class i find myself picking more and more info up. I still find myself sometimes completely lost but i was just wondering if anyones taken a class where you have no idea whats going on to start out then the class grows on you. I may take another class like this if i get the change..