I joined GTPlanet back in 2003 to get news on Gran Turismo 4. There are probably two things I've seen complained about GT4 in my 11.5 years on GTPlanet- the lack of certain manufacturers and disappointment over no online play (without the need for extra stuff). I even remember the early arguments among us about Gran Turismo 4 and some game called Forza Motorsport. Those who still play GT4 to some capacity are sad that some things added in later GTs could have been in GT4, but still have overall respect for what GT4 brought to the proverbial table. There was even the controversy of B-Spec, which many felt was Gran Turismo 4 playing itself for you.
Somehow, Gran Turismo 4 is speaking to me in a way in which I am somehow harking back to GT4. However, I don't come back to GT4 in much the same way I come back to GT1 or even GT2. All the Standard cars in GT5 and GT6 stem from GT4. I don't know... I just come back to GT4 for some reason when I look at Gran Turismo today. Something I can't explain or understand is why I am thinking about and wanting to play GT4 again- not that I've ever hated GT4.