I could never finish that either, I had to read it as part of my English Literature course at college and my tutor soured it for me, actually that tutor instilled a probably undeserved dislike of Atwood in general.
I nearly gave up on Money by Martin Amis but in the review I'd read the reviewer suggested giving it until page 50 before quitting, I was so glad I did. I rarely abandon any books, the only two that spring to mind are one called 'The Serial Killers Club' by Jeff Povey, which was awful, and Catch-22 which was ruined for me when found out how it ended.