The lecture content is barely relevant to anything you do in the assignments, pracs or tutorials for the majority of the course. Unless you have a lot of background knowledge in the area or already done a fair bit of Java or object oriented coding in general most of what is covered in lectures and tutorials will go straight over your head and he will not do much to help you out.
Joel Fenwick is a really decent lecturer, humorous exaggerations can be annoying, but are also memorable and keep things in your head. He's clearly enthusaistic about what he does, and considering the material he's teaching, it's achieving something when I never fell asleep in any of his classes. He also goes to great lengths in his own time, and is the only lecturer I've ever seen to attend tutorials, so despite everything I'm about to say, he's definitely above the average UQ lecturer that I've had.
Choosing not to record lectures is such a bad move. You might say it forces people to come and learn during semester instead of cramming and that this is better for students' learning. But Joel Fenwick is not in charge of students' time, and is not the judge of whether or not we should be in class, he does not know our circumstances and does not deserve to make that choice for us. I believe that he believes that it's the right thing to do, but it's such a bad call, and it comes off as egotistical and inconsiderate.
He also chooses to indulge in a small amount of shaming to people who aren't as up with it in nerd/IT/computer culture, and just knowing things in general. People come here to learn things they don't know, don't make fun of them for not knowing things that they're currently trying to learn. Joel himself isn't the most guilty of it, but he's been in rooms where his tutors/underlyings have done this and done nothing to prevent it. Giving attitude to kids who are looking for help does nobody any favors.
Joel Fenwick runs one of the best courses I have done at UQ. He has an amazing wit and makes every lecture humourous to a point where the operating systems and programming he lectures about are not only interesting but enjoyable.