1 ton of LRM ammo is 180 damage. It's rock solid in terms of damage per ton.
My Stalker 5M carries 14 tons of LRM ammo (lulz) along with 3 medium pulse lasers to chase off annoying lights.
So we're at 14 x 180 = 2520 potential damage.
Of course you're never going to get that. On average, I expect 2/3rds of my LRM's to do 0 damage (which is why I carry so much ammo on my LRM mechs). That leaves 1/3 of LRM's to actually hit their target. Now, on maps like Polar Highlands, Alpine Peaks, or Boreal Vault in CW that umber goes up...sometimes significantly. And it's really only Crimson or Grim(CW) that it goes down.
2520/3 = 840 damage.
Now ask yourself how often you do 840 damage in a match? Ya, I don't very often either. Even if my team roflstomps the other side, I'm only getting in on a handful of those kills. But just knowing that I *could* do that much damage warms my heart. In case you're wondering, I'm averaging just under 500 damage per match in that mech which is pretty much in line with where I'm at on most mechs.
Now I have my Stalker 5M kitted with LRM range buff, + the 5M's quirk so I can launch LRM's at targets 1250m away, and unlike lasers they still do 100% of their damage at that range (my poor, poor targets on Polar Highlands or Boreal Vault). And since I can hide behind hills and real snipers can't...ya, I win.
Even if all I was figuring in was damage, that mech is so worth bringing to a fight, but of course, that's not all. It pushes enemies to stay in cover making them easier targets for my brawler mech buddies. It encourages enemies to yolo after me leaving smaller death balls for the rest of my team. It greatly discourages enemies from moving in the open making it harder for them to maneuver around a map effectively. It utterly dominates typical PUG strategies like Pug Mountain in Alpine Peaks or trying to move across the bridge or around in the water on River City. In short, it's a non-stop mind game.
And before you go, well sure, that's one mech...
-I built a LRM Atlas that carried just as much ammo for CW drops. Mostly because it annoyed Kcom when I got to drop with them for those few days because they are definitely anti-LRM
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-For the Warhammer leaderboard event I built a 7S with nothing but 2 LRM 20's and 16 tons of ammo (2880 pot. damage). It made #13. So much lulz. Of course, it's now running a brawler build with a 76.7 alpha, but at times I do miss the LRM's.
-I ran a Huggins Raven with a single LRM15 and 8.5 tons (1530 pot. damage) of ammo that actually averaged 500 damage per match (unless it got caught sneaking around) because being a light let it set up much more likely-to-hit shots than your normal LRM boat.
...and so on...all it takes is being open to the possibility and learning how to use your LRM's effectively.