Currently the structure costs 150/20 on a race which has a fundamentally powerful economy. As tyranids you really ought to apply severe pressure onto your enemies in order to crush their economy in t1 and so you can easily overwhelm in t2 even if they bring on the big guns in the form of a dreadnought. So you want to rush a gen farm, and while your there you plant a HN. Obviously this means your playing RA. So you get the melee t1 upgrade, horms upgraded, 2x terms and a BSWB. This build is completely unmovable in t1 when near the hive node. Anything that jumps forward just gets butchered by the RA/horms; melee is crippled by the termagants and quickly suppressed and forced off; not to mention the hive node itself deals damage to nearby foes, and snares enemy units; as well of course as granting ridiculous ranged damage protection to all units in the blob. Basically in 2v2 this let's you pin your foes in their bases so you can tech to a swarmlord before they are heavily in t2, and in 1v1 it guarantees a gen farm wipe. The extent to which these occurrences are imbalanced really depends on the map. HNs are pretty OP on valderus for example. They are especially deadly to IG/eldar who lack jump units.
Basically what I'm trying to say is that hive nodes are odd in that they make the early tyranid pressure ridiculous (imagine a couple of hive nodes outside your base, 2x terms, BSWB and tunnels for quick reinforcement) and just plain too good vs space marines/IG/eldar. I don't like the way they aren't used defensively which ought to be there purpose. So I would suggest a change to them.
I think it would be better if the hive nodes were able to shoot out their protective smog over an area, this would allow it to be used as a defensive structure, just put it in a key location in the centre of the map a bit, but a little back so it won't die, and then it provides a good support role to the tyranid army like chaos shrines do, without being blatantly OP in some scenarios. Also though, because this would effectively be buffing it, it shouldn't snare melee with the smog, the smog should just reduce incoming ranged damage and shouldn't hurt enemy units if they go in it. It would also be nice then if the node itself provided basic synapse and the price was increased to 200/25.
What do you guys think, and if you don't believe me regarding hive node OP, let's play on valderus and invite me, I'll see if I can replicate what I did before






