Map Exploit
If dodging attacks later in the fight is difficult, then one can exploit the terrain and win the fight extremely easily. After getting Master Gee to fully absorb at least one acid pool, a player can simply crouch and hide behind the large rock located near the entrance, to the left as the player faces the arena. Since Master Gee continues to receive damage from the acid status effect he will eventually die without further player intervention.
Should players hide too far back and the worms start continuously burrowing and reappearing (as they do when a character is in Fight for your Life), Master Gee may disappear. His health bar will remain and the gate will still be shut, but the fight will not progress further. This can be prevented by keeping Master Gee's attention; ducking in and out of cover and firing at him to get his attention would be sufficient.