I don't understand SSJ4 Vegeta at all.

In 11th anniversary Special Battle part 1 stage 2. I have supered with him 9 times! I didn't have the RNG luck of being able to pick up 3 rainbow orbs. Dude gets supered for 1 million and i get literally one shot. How is this unit good? Mine is only 55% but still. I'm stunned by how much he gets slapped around. First turn he's fine i suppose, but after that... yea GG... Especially in slot 1.

And even after so many stack goku still does less damage than the new Evolution Vegeta part of the UI unit.

What am i missing with this unit?