He gave away a few suspect free kicks in dangerous areas, but I can only remember Pennant getting inside the full backs once all game. Defensively and positionally I think he's a lot better than people give him credit for. He just needs to improve a couple of things:
1. Knowing when shooting is wasteful.
2. Timing his tackles.
He also gave the ball away in an attacking position once or twice, which is bound to happen but he could learn not to lose it in such an outright manner. If it looks like you're going to lose it in the opponents half then you put it out of play or commit a minor foul. You do what you can to stop the opponent breaking.
I think Kolarov will come good , I think he has the essentials down he just needs another year with Bobby to work on a few things. He could be a valuable squad member though.