Okay so maybe the LAW was never here really to start with, but in the never ending quest of zombie destruction, fewer things are funnier than watching 5 zombies explode on impact and 7 more gettting hurled up in the air Saving Private Ryan style. 
I've been playing the LAW as a demo lately (Level 4 on Hard btw) just to see if I can work out if it has any use, and I've actually stumbled across a number of advantages it has over the grenade launchers. Thats right dear reader, your eyes have not decieved you, the LAW actually IS useful.
Firstly the bad that we all know.
1) Its heavy, as a demo you get no weight buff, so its LAW and pistolling, thats it, not even a damn pipe bomb or two.
2) Its reload is long, so if your target doesn't drop your up crap creek without a paddle.
3) It doesn't have a safety mechanism like the launchers, so someone strafing across your line... really screws you up.
Now the good points
1) Its explosive radius is HUGE, and it penetrates targets very well indeed. This means that unlike the launchers you can hit the target at the front of the line and usually blow the rest of them to kingdom come as well. Hard to meatshield a rocket there chaps
2) Its damage I'm sure is higher, on Hard I find a direct hit with the launcher will kill a gorefast but anything else won't. This either requires a quick swap to pistol or a nade thrown in to double bang em. Scrakes seem to be explosive resistant as well (I've hit one with a half hit on a pipe bomb, 2 nades and 6 M32 shots and still not dropped the swine). The LAW on the other hand will absolutely nuke an entire group of gorefasts, and although will not kill a scrake, it will stun him on impact, either allowing someone else to follow in.. or you to bung in another taste of that anti tank awesome
3) Also Fleshpounds aren't as immune to it as you would think. I'm not sure if other people helped, but I've killed a fair FP's few this way. I've read that the Fleshie is 50% immune to L.A.W. damage. At the same time it is 50% weak against grenades. I'm sure I've read somewhere else that the LAW rocket COUNTS as grenade damage, so they balance out to be a standard, yet high amount of damage. This means you can stack 2 grenades (Demo damage FTW), quick scope in, and fire the LAW to rage him on the nades... Boom...
4) If you trust your teammates you can also drop your LAW outside the trader, buy your pipes, lay them down and pick up your LAW as well. So the explosive fun reigns even without a line of sight
So my point of my post - The LAW is a bit of a novelty gun but actually isn't so bad. The one thng that does suck is that although the explosive damage still counts for the Demo, its ammo is tied to Shotgun for some reason rather than grenades. Not only is it heavy for Demo's to carry, but the ammo is the standard 12 shots rather than the Support Specialists 16. Since the Demolitons Expert is the explosives expert and the LAW is a rocket launcher, shouldn't he recieve at least an ammuntion boost for the thing? Discount would be nice too, since its use is similar to the M79.
I'm not by any means suggesting reduce its use for the Support, since the SS can carry it AND another gun. I'm merely suggesting making it a more viable weapon for the perk it makes just as much sense for using it. Plus its an absolute riot using the thing.
I've been playing the LAW as a demo lately (Level 4 on Hard btw) just to see if I can work out if it has any use, and I've actually stumbled across a number of advantages it has over the grenade launchers. Thats right dear reader, your eyes have not decieved you, the LAW actually IS useful.
Firstly the bad that we all know.
1) Its heavy, as a demo you get no weight buff, so its LAW and pistolling, thats it, not even a damn pipe bomb or two.
2) Its reload is long, so if your target doesn't drop your up crap creek without a paddle.
3) It doesn't have a safety mechanism like the launchers, so someone strafing across your line... really screws you up.
Now the good points
1) Its explosive radius is HUGE, and it penetrates targets very well indeed. This means that unlike the launchers you can hit the target at the front of the line and usually blow the rest of them to kingdom come as well. Hard to meatshield a rocket there chaps
2) Its damage I'm sure is higher, on Hard I find a direct hit with the launcher will kill a gorefast but anything else won't. This either requires a quick swap to pistol or a nade thrown in to double bang em. Scrakes seem to be explosive resistant as well (I've hit one with a half hit on a pipe bomb, 2 nades and 6 M32 shots and still not dropped the swine). The LAW on the other hand will absolutely nuke an entire group of gorefasts, and although will not kill a scrake, it will stun him on impact, either allowing someone else to follow in.. or you to bung in another taste of that anti tank awesome
3) Also Fleshpounds aren't as immune to it as you would think. I'm not sure if other people helped, but I've killed a fair FP's few this way. I've read that the Fleshie is 50% immune to L.A.W. damage. At the same time it is 50% weak against grenades. I'm sure I've read somewhere else that the LAW rocket COUNTS as grenade damage, so they balance out to be a standard, yet high amount of damage. This means you can stack 2 grenades (Demo damage FTW), quick scope in, and fire the LAW to rage him on the nades... Boom...
4) If you trust your teammates you can also drop your LAW outside the trader, buy your pipes, lay them down and pick up your LAW as well. So the explosive fun reigns even without a line of sight
So my point of my post - The LAW is a bit of a novelty gun but actually isn't so bad. The one thng that does suck is that although the explosive damage still counts for the Demo, its ammo is tied to Shotgun for some reason rather than grenades. Not only is it heavy for Demo's to carry, but the ammo is the standard 12 shots rather than the Support Specialists 16. Since the Demolitons Expert is the explosives expert and the LAW is a rocket launcher, shouldn't he recieve at least an ammuntion boost for the thing? Discount would be nice too, since its use is similar to the M79.
I'm not by any means suggesting reduce its use for the Support, since the SS can carry it AND another gun. I'm merely suggesting making it a more viable weapon for the perk it makes just as much sense for using it. Plus its an absolute riot using the thing.