I can't answer what Jorge would, but the PSP-3000 appears to have these bizarre and clearly visible scanlines, and the display is too bright and makes things look uglier. The first two PSP models may have heavy ghosting, but the overall image looks nicer, and the ghosting cut-back on the 3000 doesn't look that much better, and in no way makes up for how they uglified everything.
PSP SOTN looks all right when displayed on an HDTV, but yeah, the black bordering thing is absurd. There's no reason there isn't an option to scale the image to fit the screen. 480p content looks fine on my Wii, I'm sure the PSP could put out decent-looking stuff as well at full screen. I feel really gypped having paid $20 for a cable that makes the games look really tiny, and the cable is so short that I can't kick back on a couch and relax; I have to have a chair right in front of the TV in order just to lean back while playing. It's not worth it. I'd rather just play on my PSP.
PSP-3000 though has an option for composite video, and I'm sure it would look much better on an SDTV.
Really, if you wanna play SOTN, just play the original PlayStation version or download it on PS3. The 360 port has some issues.