I am with Moe on this, I hardly ever take TL. If played properly there is not much action in terms of assualting the objective. Plenty of action though with spotting, calling, directing, and SMOKE!
I can't remphasize smoke enough on certain maps. when I play as either a TL or SL I always use smoke objectively and then try and resupply for another batch to build that obscuration screen. Some maps are not conducive to multiple smoke re-charges but on the bridges map (others too) it pays off with the ammo dump on both sides on the second caps. Sometimes I just hover there and wait for a recharge and throw again to help the riflemen get in close.