Mech is a very powerful style and can be difficult to deal with if it isn't scouted properly and you don't have an overall gameplan when confronted with the matchup. These are the few styles I'm aware of when playing against mech:
- mass roach with upgrades and incorporating doom-drop play while eventually teching to t3
- upgraded ling + roach + infestors, teching quickly to t3 (although I haven't really been able to make this work)
- roach with upgrades along with infestors
- roach with bling drops (banelings on top of tanks are actually not bad)
What style do you guys think is the most effective vs. Terran mech?
My thoughts: I feel that the dynamic of ZvT mech is much like Protoss, but with units that are really cost-effective against your main midgame composition. This means that you really cannot afford to engage the Terran if he's sitting in his base and must resort to some sort of mid game harassment (via drops/nydus or multi-pronged aggression) to allow you enough time to expand, take map control, and eventually get to Broodlords.
I feel that mid-game infestors are not very useful, as neural parasite is very situational and fungal is really only good against grouped up vikings/hellions. I guess IT's would be pretty good for absorbing tank fire, but once broodlords hit the field, broodlings do a better job and don't cost any energy. Obviously the go-to composition is infestor/broodlord with some kind of buffer with roaches or upgraded lings.