I would add the S13 silvia to the list as its model has been in circulation since FM2.
while the base model is fairly decent its lacking in details with very very outdated headlight models, stock wing is incorrect shape (ends are round, not squarish) but by far the biggest inaccuracies are the dam bodykit options (RB widebody excluded)
all of the origin bodykit option look nothing like any of the real origin parts, even look at the comparison that origin posted way back when announcing they were in FM2 showing the Aggressive Line kit Origin in Forza Motorsport 2 for XBOX 360 – ORIGIN (origin-lab.com)
this is supposed to be the Stylish Line kit
this is the actual Stylish Line kit
Aggressive line in forza (also note the inaccurate GTR style grill on this bodykit compared to the real one above)
Aggressive Line in real life
If i were running a company i would be ashamed to have my brand name on those models