From watching Dreamhack, and then into the GSL I haven't seen a Terran player be able to execute an early attack successfully on a Protoss player, no matter the level of greed the Protoss player is abusing. It's not uncommon to see 6 or 7 zealots and a pair of sentries as the defense for a Protoss player heading into the 10th or 11th minute of a game. The opposite is true of Protoss players being aggressive against Terrans. I've seen Terrans lose to oracles, 2stalker mc attacks, oracle busts, four gates, blink all ins, immortal busts and even dt's.
Protoss can easily, even with minimal to no scouting information defend Terran aggression without even having to deviate from their normal build. The basic point of MSC+3 warp gates and some form of detection will stop nearly any Terran attack early on in the game, up until the mid-late. There is very little extra preparation required to stop most Terran attacks, and with good reaction time + unit positioning it's fairly easy for a high level Protoss to stop Terran aggression. Case and point is Woongjin SoS going 1 gate expand directly into a 2rax bunker rush from bomber that he scouted, not even a second thought about canceling his nexus. The next game he kills him with a 3gate (bomber lost 19 scvs to the 3gate, when sOs expanded).
The reverse is simply not true. If the Terran player is unable to scout early aggression from the Protoss player there many situations where he simply dies. The frustration however does come from one specific front, but from the multiple different ways a Terran needs to defend. Couple that with the extreme difficulty Terran has in properly scouting and figuring out what Protoss is doing. The final nail in the coffin is all the different ways a Terran needs to prepare for the various all ins a Protoss can do. Most of them require very specific setups to defend and being safe against something is hard enough even with perfect information. The case here? Polt scouting grubby's proxy oracle twice and both times being unable to defend the oncoming attacks.
Then there the greedy Protoss. If the Protoss just simply goes for extremely fast upgrades and either fast Colossus or even more scary very fast upgrades and templar the Terran player can be in a world of trouble. The case study here is Parting vs. Flash where Flash is safe against proxy oracles, scouting for anything that Parting might be hiding etc. Then Flash simply can't out micro Zealot/Archon because the upgrades Parting has are first class, Flash just dies without so much as a whimper. Now I dont want to take anything away from Parting because he proved that his builds were air tight, and he played extremely well but it was hard to watch.
The ability to read what a Protoss player is doing is also extremely difficult right now, some of the best Korean terrans in the world are struggling to get a grasp on what their opponent is doing. Hell Flash seemed confused by what Parting was going to do. 2 Pylons, 350 mined gas, a Stalker and Mothership core could easily be any build Protoss has available, from proxy oracles, blink all ins, 2stalker mc rush, dt's or a fast expansion. There is not clear indication of aggression or macro play from that particular set of buildings. Add into the mixture the randomness and lack of polish on your average ladder and things can get extremely difficult in a hurry.
The discussion point is this though. Is there an imbalance in win/lose states to TvP in the first 11-12 minutes of the game. What do I mean by this? Well simply put there is no lose state for Protoss in the early game of TvP unless the Protoss player makes a mistake regarding control/map awareness. Protoss can play a safe build and be fine against anything Terran does, assuming they react in time. Terran on the other hand has multiple lose states unless they are specifically prepared to defend them.
TLDR: Protoss can easily play safe/catch all against Terran, Terran can not play safe/catch all against Protoss. Protoss has multiple options to be aggressive against Terran, Terran has no aggressive options against Protoss. Protoss can play safely with zero scouting information, Terran needs full scouting information to defend.
My conclusion here is pretty simple. Early->Mid game TvP really needs to be looked at and taken seriously by Blizzard. The matchup is quickly becoming a ladder nightmare for a lot of Terran players, and in tournament play it's starting to really lean in Protoss players favour where small advantages become huge ones when you involve the best players in the world. I would love to see the sub 12 minute matchup winrates for TvP, but I dont have access to those statistics.
Please for the love of god discuss recent pro games, your own experiences etc. I'm extremely interested in games where equally skilled players compete that go against what I'm presenting here, so link and bring evidence. Most importantly discuss things with intelligence and respect.
I want to make this point clear as well, even though it is basically unrelated to the discussion of this thread. I feel that Terran has a huge advantage in late game TvP, and with the right mixture of units+great control will ALWAYS win the fights. I think that is something that is better discussed in different threads.