My thing with the duplicates is this: If there was ONE car per year (frames and models are updated throughout the production run, so......) that could have ALL of the options for that car (ending up with as few as dozens, and as many as hundreds of variables or "cars"), they could lower the initial car count.
Then, we could say, "But I have THIS variety", and everyone would be happier.
I don't see it happening, though.....
As far as gameplay, I did not get GT3 or 4 for myself. I did play GT3 when someone loaned me their system to play on after a surgery. It was nice. The menus were reasonable, and there were a LOT of races that I WANTED to play again!
I did have GT1 and 2, as well, during and before this time. I love GT2! It is a fun game, with good progression, fairly easy menus, and just a fun time to be had.
I have played GT5 and 6. I played 5 offline until I couldn't progress and got bored. I finally got so bored I tried out an online event that was well hosted and quite good.
That is the ONLY reason I continue to play GT. A good host creating good events. I wish PD would get back to that.
Recently, I got GT4 and a PS2 that could play it. I almost can't get past the "world" menu. It is NOT intuitive, and I really, really feel lost. It's not a pleasant thing. Mind, the graphics and races are nice. But getting to them, well, to be nice, isn't.....