I skipped a hell of a lot last year, but this year I haven't done that as much, although I still skipped a fair bit. I only went to one lecture and no classes for one of my modules, and I still passed it. Some of the lecturers practically copy it word-for-word from the textbook, and I really can't be bothered to wake up at 7 AM to catch a train in arctic conditions for that. But if the lecturer is good, I'll do my best to attend.