For a PS2 simulation racing game, it's one of the best racing sims that I ever played in my life, quite simply it's an different version to GT4 if it leans to the more "realistic" side. But of course it have it's fair bit of problems.
-Graphics still holds up rather well, even on a HD screen with an adapter! Games run at a solid 60FPS which is always a plus. But sadly there is no option for 720i and above...
-OST/Sounds are really unique and oddly fitting. The OST is a set of orchestrated music that throw some classical elements into the mix with some ambient music. And the engines notes is keeping true to the original cars, unlike a certain game series that uses computerize sounds for the engines...
-Physics are... Well, you have to play this game with a wheel to understand how you can feel the car's reactions, bumps, weight transfer, etc to get the most out of this game. And PS2 compatible wheel selection is limited too (Recommend the Logitech Driving force wheels). Using a controller will instantly hinder's you which will put you at a constant disadvantage. Casuals will not like this game at all. But more hardcore players might get a chuckle from this game!
-Content wise it's mixed, Around 200 cars and a large handful of tracks compared to GT4. And most of the time you will be doing "Enthusia Life" (Main game) and "Driving Revolution" (Driving school for this game). If you're interested in more wacky things like the "Coffee breaks" from GT4 then you're not going to be happy with this game. There is a split-screen option but good luck convening your friend to play with a controller lol...
The "Enthusia Life" is set up like the basic's of gran turismo, but with money you simply get "Enthu points" which is an upgrade system to your life bar. Yes, a life bar. If you hit almost anything that's an object it will slowly drain (Or fast if you hit a wall dead-set on going over 160+ km/h) and once it's completely drain you're forced to wait and "Recover" those points back to full. Basically Enthusia life disencourage reckless driving and playing well will grant you more life points. It sounds weird I know. The AI in this game for once are confident but they drives kinda dirty, watch out for them. And yes, for everyone too. Tracks are mostly made up with being only a few tracks that's in real life (Tsukuba and Nurburgring) and they are fun to drive around in just like GT fictional tracks!
The "Driving Revolution" is a series of challenges similar to the GT licence test. Learn how to accelerate, break, control of the car etc. All standard stuff but it's a bit more complex like keeping your speed at a set pace while finishing a part of the track, Sliding into a corner and keeping your speed without spinning out. It get's challenging rather quickly and I had to restart over several times, and I use a DFGT for a few years now!
Overall: If you want to play a old racing sim, a compatible racing wheel (You dont have to) and you have a PS2 available check this game out. It's a fresh entry to a lot of racing simulators out there!