I think the perspective is provided by what people could see last season.
In many ways we looked more impressive against good sides than against average to poor sides last season. We weren't great when we had to dominate games and looked better when we could attack on the break instead of having to break down bus parking sides ourselves whilst defending against counter attacks.
I think, like most here I believe, that the additions we've made so far will make us even better against the better sides. Paulinho, Capoue and Soldado will all thrive in those big games I think and I imagine we will continue putting in impressive performances against good sides.
The positive thing is that even without Bale or his replacement and very early in the season with 3-4 new players involved in games we look considerably better against the bus parking sides too. At least in my opinion.
Yes, getting penalties is perhaps a bit lucky or random events that will happen sometimes, but I also think that the penalties we've gotten have been partly because we've been better at getting our dangerous players on the ball in the box than last season. In a way that illustrates the progress being made that makes people positive - in context.