To be fair, no team has been dominant; it's asking too much of any team to be firing on all cylinders this early in the season.
You could argue that, for example, the Chargers completely destroyed the Cards this week. That is true, but they also got outplayed for most of the game against Kansas City in week 1 and lost.
Similarly, the Packers lost to lesser opponents last week, but beat the meat out of the Bills - who the very next week gave New England a run for their money.
It's the NFL; it is rare to see a team continuously dominate week in week out. Yes there are concerns with McCarthy's team: Special Teams and Penalties chief among them. He showed this week that he can fix penalties, and that should say something about his ability to correct the mistakes of his team because he did it with a short week this week.
Another huge positive is that, while he has not won many "big games" (whatever those may be) rarely has his team looked completely over-matched. You have to credit him for that, for having his roster ready to play despite it being the youngest for the past few years.
McCarthy, for all his flaws, is a good coach. He has coached his team to victory in more than a couple of games where their backs were against the wall. He clearly has the respect and ear of his players.
It is far, far too early to say that McCarthy does not have what it takes to bring the Lombardi trophy back home. Yes, he certainly has his flaws. But he has also done some pretty good things, too, during his tenure here.
The NFL: Where Greg Jennings Happens.