Seriously, we'd like to see the last of that Duck-worth rain rule- it ruins the excitement of matches, which were played to win, not scrape through a rain rule.
We'd also like to have the bonus points system scrapped. Some teams have manipulated it resulting in dreadful cricket, with New Zealand in the 2002 VB Series being a prime example. Net Run Rates were a lot better, and made the scene more dicey.
As for pitches, I don't mind pitches that stay the sam for the whole match. It's those dreadful win-the-toss-win-the-match pitches I hate most. Some team wins the toss, and that other team has had it. The team winning bats first and scores huge on that flat afternoon deck, and under lights, the ball moves around and the pitch gets an uneven bounc, making it nearly impossible for the other team to chase successfully. Or a pitch where the winning team inserts the other to bat on a cold, windy morning, with the ball doing strange things, getting them out to a relatively low score, then blast their bowlers around as the conditions in the chase innings are perfect for batting.