I'm sorry, you're watching a completely different Ashes series then. Johnson, is a match winner. But, that term is very misused sometimes. The difference between Australia and England has been as vast as an ocean.
1) Warner at the top has been churning out runs and he's been doing it at a rapid pace. England's best attacking batsmen has been getting himself out.
2) Australia's support bowlers are doing a remarkable job. Harris and Siddle in particular are very under-rated and do an amazing holding/attacking job.
3) I never thought a day would come where Lyon would out bowl Swann. He's done that two tests running.
4) Haddin has been far superior to Prior in all departments. Keeping, batting and as a vice captain.
5) England's fielding has been dismal if I were to be mild. Australia haven't dropped a catch.
Lastly, and I give a lot of importance to this : While England have been chopping and changing like no one's business since the last Ashes series, Australia have tried to form a nucleus and assign roles to each individual. There's a lot of talk about balance of sides and the turf that they play on and conditions, but while all that is important the most important this is to do well with whoever you have. England have simply had too many cooks spoiling the broth in various positions. Those that are steady and stable in the side, look tired and worn out.