I actually give Auguste Renoir a 5 for fragrance as I only grow highly fragrant roses in humid Maryland. It is the most fragrant rose I have grown over the past 30 years (about 30 different hybrids). I averaged score at 4 as it is not a classic formed rose and the heads are so heavy they will frequently droop. From that view it would score a 3. Unlike many of the highly fragrant roses (Bellaroma, Pope John Paul, McCartney,etc ) you will start to sense the Auguste Renoir perfume from 10 ft away in hot summer sun. I have one left that is is 20 years old and suffered through botrytis - spotted it late. Overall it is disease resistant and with own-roots it has come back. I recently had to take a drastic action and transplant it as new trees were shading it. Even with the harsh transplant it came back and bloomed well. I suspect from my own experience that what I thought was browning of the petals was actually onset of botrytis. That may not be true for those with desert conditions as I doubt botrytis is found there.
I need to learn how to take cuttings of it and start new roses.

My neighbor has this those. Its 8' T x 4'W lol. It's a beast, but it's always in bloom.

I live in the mountains of Arizona where summers are rarely as hot as those of Chicago, let alone Houston or Tulsa. My three year old plant gets about six or seven hours of very bright sunlight each day. In three years it has grown to knee height and bloomed once. The flower form was just about perfect, but the blossoms themselves were well shy of three inches across. Compared to roses in general, I'd rate it a pretty low standard; but compared with Hybrid Tea roses I've tried here, I'd say it's a bit above average.