That's not fair. SR started packed with great Bradstreet art.
Note that I wrote "overall" - of course there's been nice artwork in SR books! Bradstreet is a prime example, though most of his pics (that I know of) could've been in a CP2020 book as well as they usually showed only humans (I think there's one pic of his with an elf but did he ever draw other metahumans?) using recognizable 20th century weaponry (that is actually still in use in the much nearer future of CP2020) with smartguns connected through external wires (common in CP2020). Mike Jackson is another favorite of mine (just think Fields of Fire).But, unfortunately, much of SR's artwork was crap, pure and simple, peaking with SR3. What irked and still irks me most is the inconsistency: I-don't-know-how-many artists all drawing in different styles - widely different depictions of metahumans (my old beef, and I know I've mentioned it often: way to small and slim trolls), people using strangely (sometimes even ridiculously) shaped guns or vehicles that you can't find in any equipment book...
CP2020 on the other hand managed to use only a small group of artists with very similar styles, at least in the books published ~92-95, resulting in very coherent artwork and, at least to me, a more coherent picture of the game world. With SR artwork I've often had the impression that the respective artist actually didn't know the game at all and didn't even ask for references.
Artwork in SR4 has been good so far with one exception: The artist, I don't know the name, who did the full-page pic opening Arsenal's vehicle chapter. His or her spikes/antennae fetish aside, his/her pictures look like drawn in 1985! Totally dated style and not even done well. I can't believe someone could be paid for such low quality! I'm a book editor myself and if any artist I commissioned were to send me such a picture I'd answer, "Well, that's a rough first sketch. When can I expect the real piece?".