In fact, Ruud van Nistelrooy also managed to make Manchester United get good results. Even though it was only for a few matches, but Ruud van Nistelrooy made impressive results for me, even though he was only an interim coach, but Ruud van Nistelrooy worked very well for Manchester United. Thus, if Ruben Amorim is a great coach with above-average quality, then Ruben Amorim should also be able to continue the good trend for Ruud van Nistelrooy. But at least, the first match for Ruben Amorim later is playing against Ipswich and thus, Ruben Amorim can still guarantee a sure victory for that away match.
Too early to make a final judgment here. He hasn't been tested really so far. Two home games against Leicester in the League Cup and PAOK Saloniki in the Europa League and frankly, they should have won those games anyway. This I think is not a big deal. The draw against Chelsea was ok, but Chelsea after playing quite well this season, has not been doing very well recently. So the draw is not a big achievement or anything, it was expected I think.
The last game in the PL against Leicester City was a good performance, but Leicester had their chances, actually more chances than Manchester United, but didn't score and therefore the 3-0 win looks quite impressive, but it shouldn't be overvalued.