Personally I don't think the bonus round was too much. It's been said a bunch, but there were still a ton of good films left. And if we do a full decade next time there will be, presumably, even more remaining on the board.
Obviously the longer a draft goes the more crap is going to rise to the surface, but a certain amount of it is just bad taste. I think that needs to come out, as the draft is supposed to reflect the drafter, not necessarily an objective list of the decade's best.
I also think, no matter how many rounds you have, once the draft gets towards the end people will start taking those movies that make somebody else raise an eyebrow, but they justify by saying they can watch it thousands of times in a row on dvd.
Certainly nobody wants to slog through a week of bad superhero and sequel selections, but I think a few rounds peppered with very questionable picks is actually kind of important in getting a sense of an individual's taste.