Jayhad... you suck! j/k
It all depends what you want to get out of it. Are you there to get the high "kill count"? Do you want to be the best player out there, and have everyone's attention?
Personally I do it to look cool
No really, I just like the role. I'm quite content to leave at the end of the day with only a few kills. I don't mind getting out gunned and sitting out until the next game starts. I guess it's all personal preference.
I suggest you get an aeg and try that out first. One, it gets you into the game more and you get to see if you like it. And two, you get to meet the players and become known. Most players don't like a newbie with a hot BA rifle as they don't trust them not to shoot them up close.
Anyways you can always sell the AEG if you decide to change roles.