I like to think I'm well rounded.
I'm never the recon off on the side of a hill, trying to snipe people 500m away from the MCOM, but I'm rarely the person actually arming an MCOM at the same time. In rush I tend to focus more on just killing. After all, if I kill enough, my team can advance up and I don't need to be the one to arm it. Conquest I'm usually good about fighting on a flag, but sometimes I get caught up elsewhere for a bit.
My top five guns do include the AEK and M16 (though, that is the A3 and A4 together), but also include the AK-74M, AN-94, and somehow, the M249. I have a service star with 72 out of 89 weapons (though I'm sure I'll have the S-Tac star soon). The stars I lack are the USAS, some pistols, and equipment like the SA-18.
I'm almost never in a jet, but I do tend to whore the attack helis and IFVs when I can. I don't do the whole jihad jeep thing (or bike, etc...). If I C4 a vehicle, I actually placed the C4.