I really am in support of quick-banning Mega-Kangaskhan. People argue that Kangaskhan is really predictable with its moveset, but that is just what is so scary about it, it can do nearly everything on a single set. Kangaskhan has fantastic bulk, especially for a primarily offensive pokemon. While this isn't the worst part of Kangaskhan, it simply means that it will usually take 2 pokemon to revenge kill it, assuming that they can survive a +2 suckerpunch. Offensively this is an incredible pokemon. It can boost its attack while dealing damage meaning that even it's counters are going to be damaged before taking a boosted attack. People argue that 125 attack is not incredible, but thats not including a plus attack nature, and if you are comparing it to a pokemon that is using Life orb instead of having Mega-Kans parental bond, that pokemon would have to have 151 base attack, making Kangaskhan's damage similar to that of Life orb Groudon (its actually greater than that). While people say, oh you can run a steel type with Rocky Helmet to beat Mega-Kan, assuming that Kangaskhan is not running Fire-Punch in pokebank, this is just asking for Magnezone to come in and trap said steel-type. Honestly, if this says anything about the anti-ban side of Mega-Kan, the vast majority of them have not made more than 25 posts, so in all likely hood they lack the experience to properly tier a pokemon. I'm pretty sure the Smogon community has reached more of a concensis that Mega-Kan is Uber than Mega-Gengar. Kangaskhan really falls into the same category as Blaziken for why it is Uber: with a very simple set, and very little skill, this pokemon can sweep most of the OU tier very easily.