SD content on streaming tends to look like utter dogshit when compared to the DVD versions. For one, streaming providers always convert interlaced content to progressive output modes. Most of the time they severely botch the deinterlacing so bad, that you would easily notice jagged edges and scanlined/field blended frames.
Second, they compress the hell out of them more than the DVD MPEG-2 counterparts. A 1990s 16:9 movie on DVD that is MPEG-2 would be roughly 3-7gbs in overall size. On streaming, the SD version of that same movie would clock in at 600mbs-1.2gbs in size. Even though the stream would be using H264 (which is more advanced and efficient than MPEG-2), they would set the H264 perimeters at such low settings that PQ can noticeably suffer on top of whatever botched deinterlacing job was done.
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