No assigned work in lectures
Professor talk, and students can ask questions (if you ask too many; prof wudn't be able to finish material - everything is scheduled; he must and must finish the material) So, some/more profs don't like students who ask questions
You have tutorials (in addition of lectures) where you can bug your ta as much as you like... unfortunately, most tas are either
1) international kids
2) kids with no social skills - they can't explain you much
3) or, they don't know much about your course because they took this two-three years ago, and now have no clue about anything
So, basically most times you are on your own - and, you are loaded with way too much material -, and you start hating your life (many people whom I know either hate their lives or hate engineering and want to switch it) because everything sucks!
this wouldn't happen in first semester, hopefully