This guy can get a baby to understand mathematical analysis. I would leave the class feeling like a wizard because I would understand everything but then I never went over it at home so I would forget.
Probably the best lecturer I know so far. Artem did an excellent job of teaching us a difficult subject, somehow making it fun in the process. Very down-to-earth and turns every one of his shortcomings (read: computations) into jokes. Almost everyone in my lectures would agree with me.