I don't quite see a problem with the POW block or the Super Leaf, to be honest. POW acts almost like a Lightning item, especially for unskilled players who don't know how to avoid it, and the Super Leaf has helped me many times in MK7 WiFi. And I personally would not even consider the Blue Shell and Bullet Bill to be "good" items, considering that both require you to be in a very low ranking as is, if not 6th or below for the Blue Shell. And to be honest, a lot of good Mario Kart players have the right to complain about it, it is a bit cheap. Say you and a guy in 2nd place are fighting for 1st near the end, you both get hit, but he has higher acceleration on his kart and can just get a slight edge. It really does nothing but punish good players.