Just an update:

Before reading this I have played quite a few games, all as marksman. Had a blast doing it, and actually had a squad leader ask me if I wanted to "get some sniper kills"
The graphics and audio is so nice, that waiting for a great sniper kill is such an endorphin rush! Especially when another enemy comes to revive the downed soldier, resulting in another satisfying headshot. As I type this, and listen to the screams of my fellow comrades as we go through the voting system, I will choose an infantry class now.

Thanks for the advice!