England are not a good side. Picking a combined team how many England players would be selected? Root and er, ...that's it.
Root, Brook and Duckett are all ranked in the top 10 batsmen in International cricket and would easily get in. Weatherarld is 31 and only just been picked when they've been struggling for an opener, Labuschagne was dropped a couple of tests ago because he'd been poor for 2 years, Inglis is unproven. Green has been as average with the bat as Stokes in the last year and Stokes offers a lot more with the ball.
Generally over the last couple of years the England batting has been a lot better than the Aussies has.
Smith should be a better batsmen than Carey. He started incredibly well. He made 184* from 207 balls and 88 from 99 in the second innngs against India last summer but has really faded since.