AS VAL, from my experience of it, has to be a sneaky weapon. It's hopeless at anything other than that. Room clearances where you can get in without being seen, but grenade won't work and knifing is too risky. Firestorm might be useful, with the many entrances to the buildings.
LMG needs their bipod, apart from the MG36. Just set it up with your LOS covering team mates/a choke point.
I suppose my problem is the squads I usually run with are composed of clanmates and they never dig in, we always move from one flag to the next, so I rarely get a chance to deploy a bipod and as a result almost always use PDWs when I'm a support. That's especially useful because the PDWs burn through ammo very quickly... Maybe I'll have to play some Metro/Damavand/Bazaar only servers to get my LMG kills up, as much as I hate the meat grinder maps.
And yeah, I have yet to find a situation where I can use the AS Val, so maybe it's just not for me. I used to be quite good at being sneaky-ish but now I tend to get involved in full on gunfights all the time without even trying, it's kind of annoying because I prefer being sneaky! Anyway, I'm glad it's not just me struggling with it, I suspect it was nerfed in the patch though because I used to get killed by it a lot and it seemed quite overpowered.
I got BF1943 when it came out, it's great fun for casual play. I have quite a fun story from that game, actually, the short version being that my brother and I were on two separate PS3s in the same room, playing in the same server, and I basically helped him snipe a guy at such a range that my brother couldn't see him at all. Imagine trying to snipe from one carrier to the next on Wake Island, then double that range (remember what the draw distances are like on 1943), that's how far it was.
Oh and that guide is excellent, it's apparently quite popular given the number of tank jackings I've been able to pull off lately. It's amazing how people panic when you stand next to their tank, to the extent that they'll instantly hop out even though the different classes look as distinctive as they do. My current method of dealing with tanks if I'm assault or recon is to just stand next to them and wait for the tank on the map to turn white, and if I survive the run up to the tank it works maybe half the time (the other half of the time the driver manages to drive away quickly and shoot me).
One time I had a hilarious tank swapping fight with an enemy, it was damaged and I ran up to it (as an assault). He hopped out to kill me, I quickly hopped in but it was starting to die and he was an engineer, so I thought 'uh oh' and hopped back out. He hopped in, saw it was ready to explode, hopped back out practically on the end of my MP7, so I killed him and ran before the tank blew.