Real Oviedo is not a big team and maybe they are not a tough opponent for Real Madrid, but still, winning is something that means important for any team, including Real Madrid. So this is good progress for Real Madrid, and with this winning streak keep them close to Barcelona. I think their performance really improved compared to last season, and the most striking thing is their back line, which is now more solid. 2 matches have passed, and Real Madrid have not conceded a goal yet.
I quite agree with you that they are not a tough opponent for Real Madrid but it wasn't also easy for them to penetrate at first, but at the middle of the match they found it easy. This is a sign that Real Madrid are getting back because they strategies they use at the beginning changes immediately when the Favor wasn't on their side. Real Madrid performed as expected because they really have to put more effort to make all the fans forget about the disaster that happened last season. The sign that Real Oviedo are showing was as if they are not ready to continue their existence in the league but since it's still the beginning, I will not conclude because 36 games that remains can actually bring changes before the end.