I've been playing with it lately as well, but after a couple of rounds, when I am tired of getting my a$$ whipped on small maps, I give in and go back to the other guns.Have to agree, it's more rewarding, even if you only get 1 or 2 kills the entire map, getting kills with that sniper than with the other guns.
Next, try the M16 as well. Burst fire and pretty high damage. To keep the game interesting, I would say, play with the L96A1 > M16 > knife only > other guns.
The FN FAL is also a nice gun that's rewarding when you get the kill.