It's a very strong team and will become even stronger when those who miss Australian selction join the team. Being on the weaker side of the draw Samoa would be favourites to make it to the final Vs NZ or Australia.
The players are going to cop an enormous amount of flack from the English crowds, expect chants of "where were you born? " " Aussie, Aussie, Aussie Oi oi oi " ..etc and also from the English media ( mostly from Rugby Union writers ) and of course social media ( mostly from Union fans)
If they can ignore the outside noise they'll have a successful world cup.