It's not bad, actually. You've got the range of the lasers, the grenade launcher brings your damage back up, and your guys keep their mobility and close-in accuracy. Pretty nice jack of all trades load. And I'd hardly call it overly expensive. You won't see backwoods militia hauling this gear, but I wouldn't see any problem with a front line regiment packing this, such as one of the regiments attached to an RCT.
You know who I might see with a good middle-road load like this? Smaller entities. Not talking single-world units, I'm talking mercs, corpsec. They don't have the near-bottomless treasuries of a House or March, but they also don't have to outfit millions of infantry. When you're only buying guns for a company or two, and the success or failure of those troops may mean the death or severe maiming of your entire outfit, opting to go a tier or two higher than the cheapest mass-produced crap you can find isn't going to put THAT big a dent in your budget.
Hell, opting to have your mechwarriors fire off one or two less tons of LRM ammo during a peacetime training garrison would probably make up the budget difference.