243a0200_ne_Arena_Strategy___Blue_is_Me__Advantages
[Name] Marine [Disadvantages] Weak against alot of units, including devil dogs, colossus, warp zealot, crackling, psi-storm, etc. [Advantages] 
If upgraded enough, becomes the most powerful unit because of numbers and fast spawn rate. very high attack speed and DPS if upgraded. Can attack both air and ground.
Starcraft 2: Marine Arena Strategy | Blue is Me
Advantages