I rarely play ESF, but when I do, I
always pick Goku.
Why?
Even if everyone around me is doing melee, I will hide in a corner of the map (near the top if I can), and start charging a Spirit Bomb. Usually, someone will come over and kill me before it gets fully charged. But I keep respawning and trying again.
Eventually, I get a fully charged Spirit Bomb, and I send it right into a mass of people in melee. After getting about 5-6 kills in one shot, I generally get kicked from the server.
And that is why Goku is my favorite (when I play every 3 months or so).