I was taking a look at some of the units that I rarely see or use msyelf. My thoughts:
These guys lack a role at the moment. Either they go up against armoured opponents and can't damage them enough, or they come up against AP damage and their own armour doesn't hold up. They usually end up in bad matchups that don't favour them. "slow heavy armour infantry with low AP" is a unit type that is suited poorly to multiplayer, or at least the Chaos faction. Why not make them more like Orc Big Uns and give them decent AP damage? They deserve to be a good generalist unit, which they aren't.
They got nerfed into the ground even though they seem to be barely used in MP anyway. It was only the 300-gold spearmen that everybody had a problem with. There's no way these guys are going to perform at 400pts compared to their 300pt counterparts. At this point I'd reduce their cost to 350. It works fine for Eternal Guard to pay 50 points for shields and melee defence so it should be the same here.
They are outranged by a lot of javelin units which I find odd. And their range is so short that even heavy cavalry are always getting a charge speed bonus against them, which makes them rubbish at being evasive fast cav. Their AP damage is oddly low too, it could go up to 2-4.
Helblaster Volley Gun
It's still bad even with the price buff. I'd consider reducing it's ammo and upping it's damage and accuracy in order to make it an elite infantry deleter. Might be worth the cost if it could reliably decimate a unit of Black Orcs before the lines closed. Presently it does about 33-50% damage to an elite running infantry unit that is strung out before the lines close, which is rubbish for 1300 gold.
Quarellers (great weapons)
They are overshadowered by Rangers with great weapons for the same price.
These guys are good if they get into melee unscathed, which is basically never. You don't buy many Hammerers because they are so expensive, so usually your one unit of Hammerers gets
hammered targeted early on, because Hammerers die just as well as most other infantry against spells and artillery. These guys could maybe be price-buffed when Runelords inevitably get nerfed.
It's a relatively small bump to get regeneration with the lodestone for 650 and it seems pricey for what it does otherwise.
Corpse cart (Balefire)
If I'm understanding this correctly it makes magic recharge slower for every wizard within 45m. This seems pretty bad. Maybe it would be better if it was map-wide like the Night Goblin Shaman's Sneaky Stealin' ability. Still wouldn't be worth it at it's current price.
Vanguard and no shields isn't that good. I don't think they are worth 100 over Gors with shields.
Not that good now, haven't seen it once since patch. I think the Cygor spam army has had it's day with the summoning changes, so the era of the defensive Beastmen artillery camping army is over. Goodnight, sweet prince.