243a0200_ne_Arena_Strategy___Blue_is_Me__Advantages
[Name] Devil Dog [Disadvantages] Cannot attack air. Stalker Lancers and Goliaths do decent against it. [Advantages] 
With armor and flamethrower / burn upgrades, can be very effective at killing bio units, especially marines. Hard to stop with lots of armor. Not many weaknesses.
Starcraft 2: Marine Arena Strategy | Blue is Me
Advantages