I know many people might consider this is stupid because currently marines are considered the top dogs and Nids not so much. However, I suddenly found that Tyranids has the perfect tools to give
SM a real hard game. Put it short, they actually outrun, out-scores and out-shoot marines (in terms of high-quality firepower, e.g. S7/8
AP-2/-3 firepower, Marine's shooting are basically high-quality-but-low-quantity and high-quantity-but-low-quality, unless you buy those "Oh-so-
OP"
FW units like Levithan Dreadought, Whirlwind Scropious, Relic Contemptor Dreadnought, etc. While Nidz has decent amount of High-Quality-and-High-Quantity shooting units even outside
FW units).
The troublesome Nidz units for
SM to deal with includes:
1. Exocrine, which is T8 Sv3+ and pack 12 shots S7
AP-3 2
dmg. Easily wipe a full squad of Intercessors, bikers and Terminators off the board in one go when buffed by exploding on 6s to hit psychic power
2. Hive Guards, 6 strong unit packs 24 shots (shoot twice stratagem) S8
AP-2 D3
dmg ignore
LoS, kills everything not T8+, defensive side they can ignore
AP-1 and -2 with the adaptive biology so marine Doctrines is nothing but gak.
3. Zoanthrope / Neurothrope and Biovores, MWs out of the ass, and
MW spam is one of the worst nightmare for "elite" army like
SM.
4. Malanthrope and Venomthrope, protects the Nidz gunline with -1 to hit. Thank goodness now "subtract to hit roll" is capped at -1.
5. Hordes of Genestealers, they are not hard to kill as
SM, but whenever Nidz goes first, they can rush up the field for board control.
It can be reasonably expected that any moderate Nidz 2000pts list is going to have:
HQ: Malanthrope, Neurothrope, Broodlord;
Troops: a couple Ripper Swarms, a block of Termagant screen, 2 blocks of 20 Genestealers;
Elites: 1-2 units of 6 Hiveguards, 1-2 units of 6 Zoanthropes
Heavy Support: 2 Exocrines, 1 full units of Biovores.
If
SM going first, then there might still be a chance to deal with them, like lobbing
TFC cannon shots on the Genestealers to stop them from running up the field, have some lascannon equivalent shots on the Exocrines to take out maybe one of them, have Droppod Gravcannon Devastators coming down to take maybe one Exocrines out. But if Nidz going first, then disasters begins: the Genestealers runs up the fields denying drop zones for
SM and maybe make a T1 charge. Any
SM lascannon / missle launcher platfroms will be deleted by Exocrines and Hiveguards, which can vomits a total of 36 S8
AP-2 D3
dmg ignore cover and
LoS shots as well as 24 S7
AP-3 2
dmg shots and 12 of them are with exploding 6s to hit. Its not likely that any non-
FW SM heavy gun platform with similar points costs of those Nidz gun-beasts can survive such first volley. After that, the Nidz gunline and psykers can just pick
SM apart from miles away

while other small units sit on objectives raising the banner high.
I think of the scenarios over and over, but it seems like that the only possible counter is to take "Oh-so-
OP" Ironhand Chapter, use Ironfather Ferrios and Chief Apothecary, and 20+ Intercessors, 2-3 blocks of 5-6 Aggressors, and Droppod Grav Cannon Devastator, and Stormtalon Gunships. The infantry blocks on ground is to survive through the Nidz crazy firepower with their 5++ / 5+++ and healing of the Apothecary while shoot down Nidz light infantry, although surviving such firepower still largely need to based on luck
tbh

, it is not convincing to say those Aggressors could survive the Nidz first volley

. Droppod Grav Cannon are used to kill the Exocrines T2

after those Genestealer blockade is eliminated by Aggressors and Intercessors, and Stormtalon Gunships will aim those Hiveguards behind the
LoS blocking ruins.
Any other thoughts on this case? Any other ideas?
BTW, anyone say Nidz are good in close combat only? Watch those Hive Guards and Exocrines