for real physics it's inferior to anything on the PC
Inferior to
anything? I disagree. It's a pretty good simulation of real car behaviour. I've said as much in my long post in the GT5P vs. Enthusia post in this subforum, and there are plenty of vids on youtube that display the accuracy of the physics, with this one being probably the best:
LFS is definitely better (on physics alone), and I haven't played iRacing or Rfactor, but RACE and GTR aren't up to Enthusia's level, at least for the driving feel. There's just a few that aren't as good. There are probably a bunch more too.
GT4 was a better overall game, eventhough you can argue about physics not being good at certain areas.
GT4's physics aren't as good as EPR's, but I agree that it's a better game on balance than EPR. However, I'm glad for the change. I'm playing EPR at the moment - when I get bored of it, I can play GT4 again.
if you want p2p WRC rally, you should probably invest in one of Colin McCrea's games or Richard Burns Rally
Spelled
McRae 
The McRae games are fun, but not the last word in realism, so a fan of realism would be best off sticking with GT or Enthusia. RBR is supposed to be brilliant, but I haven't played it so can't comment myself.
The only one I would recommend this to is someone that wants a spare sim racer.
I'd be happy to recommend it to anyone who likes Gran Turismo, as it's similar enough to appeal to most. And of course, it offers different content from GT in the form of it's original courses and choice of cars, so it offers some things that GT can't, which again is enough reason to recommend it.
Especially as PS2 games are available so cheaply now. I bought Enthusia for about £3 including postage. What's that, about five bucks at the moment?