Time wasting is a tricky one - we face it from 80% of the teams who come to the Etihad at 0-0 or if the other team are ahead, but it's within the laws of the game. The ref adds on the time as he sees fit. Every team who find themselves in dire need of 3 points will try to run down the clock, and it's the opposing team's job to negate that. As much as you're desperate for three points, so are City. Had it been 1-0 to Sunderland I think you'd be looking to see the game out too.
As for play acting? - it's a matter of opinion. Aguero was caught - the gash on his leg clearly showed it. Accidental, but caught all the same. Demichelis was caught by an elbow too (probably accidentally) - again clearly seen on camera. Otamendi was also caught with an elbow (probably deliberately). There are ways to interpret the game and it could be argued that Defoe was fortunate not to see red. There are arguments from both sides, but at least accept there ARE two sides to the story!