Here's a high lvl replay showing how broken nebs are when they are spammed.
http://forums.europeinruins.com/index.php?topic=15870.msg271240;topicseen#newCannonball and I are no slouches. Those things are mean!
You should not be able to call on 8 of these and have it be an acceptable starting call in.
The gun is abnormally hard to kill, it needs a nerf in HP and also in availibility. These things should be seen as frequently as paks, which should be 2-4 at the most.
250mm neb = 320 HP
150mm neb = 250 HP
Pak36 = 300 HP
It should be 300 HP at the most.
The crew should not have green cover either. (they do afaik)
Availability should be upped from 6 to 8 or 9 so when you buy 4-5 nebs you start to oversupply.
Vet needs to be redone, the requirements need to be upped by 5-10 at each level.
Target tables need to be relooked at too.
It is a multi tasking unit, it can take on both AI and AT roles, and when fielded in numbers, they become much too cost effective.
No other support weapon has this kind of capability except to an extent the bofors, and that is immobile.
150 damage is way too much, especially when the rockets penetrate most tanks all the time.
Shermans and cromwells get penetrated at all ranges 100% of the time, while pershings get penetrated 70% at all ranges.
Most dedicated AT is not even this good. Reduce penetration vs. armor or decrease the projectile speed to compensate.
Final note, If you flank these things they should die; and at the moment, they do not. They have enough gun health and crew health to turn and return fire, or track a tank. This leads to problems with their speed. The vet speed buffs should be gone.
They are too fast.
Smart players will dodge indirect fire. I dedicated my bombing runs to killing the 250mm nebs the last game I played and got maybe 2 because they move so fast.
Some combination of these nerfs must be given to the 250mm cause at the moment, in numbers it is broken. Its so good that it allows a support weapon to become a front line unit.
The cost is simply too high to counter them effectively.