I'm making this post to see if I'm missing something. I mean, my $35 Raspberry Pi 3, running FBA/MAME (which won't play most games like these, but it does play a few, and several of the earlier versions which are near-identical), and that RP3 absolutely destroys the Xbox 360 in terms of how much better it looks (and highlights even more how bad the Xbox 360 looks on these ports).
Was I expecting too much? I even tried keeping the scaling stock (since it looks like a game or two even tells you what the integer scale is, so I wanted to keep it at a proper multiplier with hopes that the games would look a bit better), and they still looks pretty miserable if I'm to be honest.
Here's my spreadsheet, with the especially awful games highlighted in yellow on the right:

Sorry if my notes might come across as a little too blunt if there's fans of these ports - they weren't meant for public consumption, just my personal notes to myself. To their credit some of them did re-do the graphics of the ships flying across the screen so they're a bit higher-definition, but then they seem to leave the backgrounds as 240p still?
Now I did build a MAME computer, which can play some of these (still trying to figure out that whole hot mess TBH - keeping 4x fightsticks mapped 100% of the time between reboots is like pulling teeth...), so this might be a moot point, and I also want to try these Xbox 360 games downscaled to my CRT's (just as a fun exercise to learn more about the Corio2 scalers basically), but I'm really curious why they would look so bad, if there's anything I can try, or if that's just how it is (and if it is 'just how it is', then it kinda blows my mind with how much people talk about these as being awesome, especially with the absolutely crazy prices theseJapanese 360 games go for...I mean, of my ~40 or so Xbox 360 NTSC/USA games, I think the highest priced one was literally $13 lol).