What has he done in two months? He's raised England from being a team that lost to Wales to being one that beat Wales. Everybody claims that England performed badly in the World Cup - which is true - but they were in a group with an SH side and an NH side that is currently very strong (for the NH). Given that group, qualification for the knock out stage was always gong to be difficult.
That's right - one of Wales or England was going out in the group stages, as neither is anything like as strong as Australia.
Aside from the poor tactical decision at the end of the England/Wales game (the decision not to kick for goal) actually I think England were rather unlucky to lose. The largely dominated the game and should have won fairly easily. Wales got lucky with their try, which lets face it, fell really kindly for them as the kick could have bounced any number of ways, but it fell just right.
Of course the biggest nonsense here is the decision to select the groupings years in advance, which mean this really was the group of death, as Fiji are no slouches either.