I'm personally not a fan of power point presentations as the predominant form of notes for a class because of their bare-bones skeleton nature. Worse is if the power points are written in fragment sentences.
If you have means of re-listening or re-watching lectures, I feel this is the way to go in conjunction with the power point slides. This way you can hear the speaker give emphasis, repeat things, etc to give you ideas on what is important or not. If they spend 5-10 minutes on a power point slide, you can bet it is important. If they read a bullet point in 3 seconds verbatim and move on without ever revisiting it, it probably isn't that useful.
Some of my classes had <400 words on their 1 hour power point lecture. Re-reading those same 400 words in my opinion was just memorization. I had a friend who could tell me information and tell me that it was from the lower left slide on page 3 but couldn't really synthesize or construct with that information. I personally had to read the slide, re-listen to the lecture, and read outside, related texts to get perspective on what was important to know. The more overlaps and emphasis of information, the more relevant it was.
It may sound time-consuming but to me it was way faster and way more meaningful than reading the same 400 words four or more times.
