I like playing the Soldier class. Why, I am going to tell you bellow.
So I like playing the Soldier class for two reasons. One of them si because that's the original commander Shepard since he was a soldier adn an earthborn, being a sole survivor on Akuze. I like to keep the original story since I have read all the books and read all the comic books. And second of all, because since the game is an action-rpg, i like shooting a lot with guns and behind corners, so to speak keep it simple and drive all the bullets into your enemy untill his body hits the floor. So as a conclusion I like playing a Soldier to keep the originality of the story and just because shooting in Mass Effect has never been more fun than in other games that I have played.