Dragon Ball: Sparking! Zero is not a balanced game. If you jump into a ranked battle with a Frieza Force Soldier and you run into someone playing Beerus, you're going to get absolutely cooked. A degree of skill can tip the scales in your favour, but ultimately some matchups are going to be too much of an uphill battle.
Now let me clarify something: none of what I just said is a complaint. I love that Sparking! Zero, just like the Budokai Tenkaichi games before it, is deliberately unbalanced.