[crAzerk]

I can't really speak for TvP much because I'm not that experienced but I asked you to be specific about those so that others (like Erasmus) can help

As an example I guess seeing a zerg go mass ling, and preparing for muta but instead getting infestor. By this point, I've sunk a lot of economy into turrets and thors (and the tech to go with it) and instead I'm scrambling to get together some Ghosts. I'm aware of the 10 min muta timing, and others I notice are around 13 and 16 minutes (some of these may just be delayed by opponent macro).

There's no need to overreact by getting Thors when they get Mutas - as Erasmus said, marines and 1-2 well-placed turrets are all you need to fend off the initial Muta harass.

The turrets at each base will also help to deter any kind of burrowed Infestor play which I used to do alot, so it's well-worth the investment.

As one caster mentioned recently (can't remember who), in TvZ marine/tank vs ling/bane/muta, it's a fairly even matchup and it depends on who has the better micro / unit placements / decision-making. Your build isn't really going to change much even if he goes ling-infestor, just remember to keep working towards that all-powerful 3/3 Infantry upgrades (most BSGP players stop at 1/1)

What MAY change would be your playstyle - so when you open marine/tank/medivac and you realize he's gone infestor, start doing drops! With infestors he has limited air control and you can terrorize his bases with multi-prong drops and the such and there's nothing much he can do. Snipe queens, kill drones, etc.
I would go as far to say that ling-infestor is an inferior build just because it's not ideal for handling drops. I prefer ling-muta into infestors later on (when marines go 2/2 and above and start getting out of hand)

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