Samoa has lost to the European sides previously, although in fairness most of these matches were played years ago, simply because the Northern and Southern Hemisphere teams don't meet enough.
Ireland, France, England and Wales all have wins over Samoa, whilst Scotland has a draw.
Regardless, Samoa can be a force, and on paper, have a better squad than what they showed more recently against Fiji and in the 2017 RLWC. For me, Samoa's coaching staff is the issue. Multiple people have claimed now that Parish doesn't really support the players embracing their culture, and considering how they went in the 2014 Four Nations (where they also almost beat England, and from being at the match in Wollongong, were closer than the scoreline indicated), haven't really kicked on.
Anyway, from a selfish point of view, with England now almost locked in to play Samoa, I hope the match is at Bankwest, I hope SBW plays, and I look forward to being at the game.