Exactly how I feel, and I'm English. Well, from the northwest of England.... it's different.
To be fair to both sides, I watch a whole lot more southern hem rugby, as that's the way my fancy is tickled. Hard for me to know just how good England might be, in that regard. Yes, oz have threats. Not sure their front row is up to a great deal. Karevi has been excellent in matches I have seen.
The people I speak to are generally expecting England to romp. These are, in general, not English people. So it's a neutral opinion of sorts. I wish I shared their optimism. England are a side that can lose 15-12 to Ireland, or narrowly beat them, and then beat them by 50 three months later. I think the former, is the side I expect. Tight and predictable. So not much for any side to worry about, from England, that they don't already know. England have not looked flash either at the RWC, fair to say. Oz looked good against Wales, who rather hung on in my opinion.
Agree with an early comment I read that, any of the 8 sides could win their match, and I would consider none to be a major upset. I do think the boks will win comfortably over Japan, having said that.
Now a case of "let the proper rugby begin" as I am at pains to remember many of the pool games I got up to watch in their entirety.