In all honesty, people claiming that the Symonds decision has cost India the whole series are being a bit dramatic. The simple fact is that if you get a poor decision or drop a catch or take a wicket off a no ball or anything like that, you move on, put it behind you and create another chance. Symonds was definitely out caught behind, yes. Nevertheless, Hogg made 70+, cought have been caught early on his innings, but was otherwise relatively chanceless, and he's not exactly Ponting or Tendulkar. India have nobody to blame but themselves and their lacklustre performance with the ball and in the field once the Hogg/Symonds partnership was going for those runs. Similarly, Symonds was on what, 30 when he was given not out? He made another 100 runs. How many runs did India give up to abysmal fielding during that partnership, and how many chances might have been created with more attacking field placings when Australia were still 6/200 odd.
India let their heads drop and bowled and fielded poorly following the Symonds decision. Yes, it was an awful decision and never should have happened, but Australia still shouldn't be looking at a 400+ first innings total. A team capable of beating Australia on home soil wouldn't give it away so easily, simple as that. India were brilliant for the first half of the day and dismal in the second half. I guarantee you that when Australia get the next shocking decision (and yes, like every other team they do get them, and anyone who has watched the series so far could name a few with ease), they won't react in the same way.