The umpring has been poor in the 2 games from both umpires. However, to call them a cheat or incapable of doing their job is a bit harsh. There are several factors the lead to poor decisions:
Experience (especially the Indian umpire)
Environment - noise, pressure to give right decisions
Yuvi's LBW decision was as bad as Cooks, but that does not neutralise the mistake.
What's happening with the DRS between BCCI and ICC is anyone's guess as there is nothing in then public domain which clearly explains either sides views and agrees of disagreement. We know what te press releases say, not what happens behind closed doors.
From my point of view, third umpire should only be used for runouts and stumpings. Rest all decisions, on-field umpires should have the final all (whether given correctly or wrongly). DRS has made umpires overly cautious and hence fail to make calls in tight situations.