Shintar did not seem to enjoy fighting Deathwing much because he is too big to see. The sense of scale gets all thrown off and things just get confusing and disorienting.
The solution is obvious: Make him even bigger.
If Deathwing were even bigger, we could have the fight on him.
Phase one: Dodging claws as you run toward him with the goal of everyone being securely hanging onto a claw before he takes flight.
Phase two: Stab his ankles. Gnomes do 50% extra damage due to having a higher ankle-stabbing skill. Much of this phase is "dance" as you have to move to avoid him smashing you against walls.
Phase three: Climb onto his back and attack the plates. As they are broken, fire blasts out, breaking LoS and being an instant kill. It is important to kill them in something like a reasonable pattern. Black dragons are the main opponents, swooping in to grab people and fly them away. You must kill them before they can fly too high, somewhat like valkyr and LK in ICC.
Phase four: Deathwing is spewing fire from everywhere and clawing like mad. The goal is to run away and hide, fighting through waves of enemies while he slowly drags himself along after you (remember, his ankles are a mess). The phase ends with the escape ship flying away, a 30 second timer which begins when the first person is fully on board.
Phase five: You fly away and Deathwing explodes in the background, showering the deck with loot.