thing about the commerce courses i've taken
(acct1501/acct1511/econ1101/econ1102/fins1612/fins1613)
So far the lecturers have merely read off the lecture slides, maybe a adjective change here and there, but basically just back to reading off the lecture slides to the class.
No special or new knowledge imparted in the lectures. So if you can read the lecture notes by yourself at home (or applicable) then skipping commerce lectures seems fine. Of course if you can't settle yourself to read the lecture notes and want the lecturer to basically read them to you, then commerce lectures is the place to go.