Swarm host is bullshit and needs a huge nerf. Mass swarm host pretty much shuts down all mech play.
Maybe if they give longer downtime animation for burrowing/unburrowing just like the siege tanks, and temporarily reveal their burrow location when they spawn locusts, then it would be balanced. Right now it;s just f***ing retarded that they can just burrow, spawn locusts and attack extremely long distances, and unburrow away so fast.

all three of those are useless against mass swarm hosts.

but then he'll have the same bullshit ling banes

From Liquipedia:
In my opinion, it's not worth the cost and time.

Two Vipers cost 200/400/6 (minerals/gas/supply) +200/150 for Hive.  Comparing it to 3 infestors (300/450/6) +150/150 for pathogen glands and how much earlier you could get infestors compared to vipers. 

Also, except for its Blinding Cloud, it wouldn't do much against mass roach/hydra as opposed to throwing fungal growths from the infestors.

And if your opponent goes Mutalisks, teching to Hive (and ultimately to Vipers) will be a big waste.

On his stream during the Beta, IdrA beat Skytoss using Hydra/Viper/Swarmhost.  He was grabbing the Tempests with his Vipers towards the hold-position Hydralisks positioned behind the Swarmhosts.  This whittled down the Skytoss force, forcing the toss to go Stalker.  But IdrA was already morphing his Corruptors to Broodlords.

That, if I remember correctly, was a 40 minute game.

Yep, good point.  Vipers are 3 supply. So are Swarm Hosts.  Then you have Infestors, Hydralisks at 2 supply each.

Spore front line is good, so make sure you have creep tumors ready to spread forward.  I suddenly realized, with a ton of spores, if the Toss tech-switches to gateway units, you're done for.

Goodness, I love this game.  Makes me think a lot.

the medivac ignition is imba thou~ but swarm host n mutalisk is imba definitely need some nerfing

n yet zerg win tournament's~

really~? how many spell caster zerg hav compare to toss~?

You don't actually NEED to use corruption to win, or make changelings to win lol. Protoss actually needs to activate, lift, storm, guardian shield, forcefield, time warp etc so no.

Your point was this.

So no, during battle you DON'T use injects (except for macro of course), you don't cast changelings. While protoss actually need to use ALL their casting abilities or they lose. And Zergs don't make infestors now. Other than microing a potential flank and A-moving their army, you only use abducts.