Either you're not seeing the difference in those three, or something is wrong. Blu-Ray should be noticeably better than the other two, and in my case (not a great Internet pipe) there's a dramatic dropoff from DVD to streaming.
I think there’s some magic going on between the Panasonic Blu Ray and the Panasonic TV. The inbound signal from my old DVD player SUCKS when played through the new TV, but the inbound signal from my new Panny Blu Ray shows the same DVD in STUNNING quality.
My guess is that there is some rather tremendously capable video signal upgrade processing to make original DVD content more beautiful than it really has a right to be in its original form. My guess: some really smart / fast / well programmed CPU in there is interpolating and smoothing the datastream so that my eyes are well fooled.
I’m a photographer. I use medium format (120) Fuji Velvia (ASA 50) slide film. I’m extremely sensitive to how things look. For example, I have never seen an LCD that was acceptable, which is why I have plasma.
Is it possible to see the difference between DVD and Blu Ray coming through my Panasonic equipment? Yes, but just barely. I have to really look hard. Can I see the difference between a DVD and a Netflix download? Again, Yes, but just barely and I really have to look hard.
The difference is so small that I wouldn’t pay an extra buck for a Blu Ray compared to Netflix streaming. There is no effective difference to my eyes when enjoying the content.
With the show “24” streamed down from Netflix, it is like watching a TV show in a movie theater. REALLY sharper than any TV experience ever for me. But then, I never had (still don’t have) cable.