Asking a professor to teach better
If you want to bring this up with them, you need to focus on concrete things you want done differently. "Try harder" is going to (a) antagonize them and (b) not change anything for you (except maybe for the worse). The professor, as you say, is aware that they are not putting in much effort, and it is very unlikely that they will change this habit unless forced to.

I suggest thinking about what, concretely, would help you most if done differently. If you need more in-class examples, raise the issue as "I feel the class would profit from working through more examples in class". If the inconsistent notation is a problem, ask him if it is possible to unify notation. These are not things that are an incredible effort for the teacher, so they have a realistic chance of getting addressed. Complaining and hoping that the teacher somehow sees the error of their ways isn't.

That said, there is a good chance that all complaints and requests coming from you directly to the teacher will be brushed aside. If the teacher is as badly prepared and unmotivated as you say, they are probably not the kind of person who would care deeply about student satisfaction. In that case, going one level higher (i.e., complaining to the programme manager or equivalent) is often more useful. While this will not typically improve things rapidly, it will likely improve the situation of this course over time, especially if complaints are raised from different classes (it's hard to continue to brush off student complaints if the same complaints come again and again for multiple years).