Screw the Desmodus, XM8 for the win.
Rifleman is intended to be an all-around versatile class. If you spend everything on pointman, you'll end up having alot of difficulty combating snipers at longer distances.
Also, I forgot to say this. Playing pointman is, in some extent, situational. Something like E-boat, Cross steal, and other "rush-based" game modes will work fine. To succeed with pointman, you need to be IN THEIR FACE (more like 5-10 meters) and you are literally spraying the gun (with some control, of course). Playing pointman is like a gamble. You wreck, or get wrecked.
Regardless of your choice buy one good gun for the class you end up NOT choosing just in case you need to be that class for any reason.