Seriously, most of the time people bring ther Khans with them, I can't even counter them properly if they decided to safeguard+swagger themselves. Also, this guy I just fought who abused Critical Swift Swim Kingdra on my team made me realize that.
I don't think it's unbalanced. Some Pokemon are better than others but that's true in probably all formats. Kangaskhan is one of the stronger Pokemon in the game but it's not unbeatable. My current team is entirely made up of the stronger Pokemon and I lose just fine, some of the time to players with rather unusual choices. If you looks at the recent tournament results some have pretty standard teams and others have more interesting teams. Although I don't think it got to the top 16, the team that helped knock out Cybertron had a Mega Aerodactyl and Cryogonal.
As someone who uses Kangaskhan I hate Mienshao and am thinking of adding a ghost type to my team to switch into High Jump Kick.
That and Megakan is highly overrated in this format because it's EXTREMELY easy to shut down any physical attacker and any good player will have counters for it. I.E, pokemon with iron bar or rough skin with rocky helmet.
FC:3840-5960-0959 Friend safari:Riolu, Machoke, and Pancham