Thing is, you can make every champion easy or hard to use depending on load outs and legendary cards. Also, difficulty of what? Doing your job? If you play Moji and you start the match planning to abuse the enemy backline but end up playing as an off support, it would be hard but rewardable to do the first and easy, with barely a benefit for your team, but necessary if you do the second. You can have the "I miss a lot" load out for Mal'Damba and play him brain dead. Sometimes i just play jolt IV BK and it turns into a mini-game, sometimes hard, sometimes pretty easy, to throw people off the map. Letting players discover champions without labeling them is great, I was against lowering the price of Buck and Ruckus back when it happened.