I've never really considered it until recently, but a large part of the appeal of these figures is the costumes and designs and the characters, and those haven't slumped from the OT to the PT IMO.
I have come to the point where if I don't like a character or don't recognize one, I won't buy it. The background/obscure PT figs don't interest me as much as the OT ones do. That's mostly nostalgia, but hey. The Waitress Droid and the Nightclub patrons for example didn't do it for me. Figs like Adm. Ozzel and Madine and any boring old guy really don't either, but a lot of these great OT figs we're getting in 2004 I've been waiting for since the 80's.
The only real 'wants' from the OT for me are Dorme, some more Jedi, all the Amidala's, and clones. More clones.