The G25 feels good to me. Feels like my MX-5, like my racing Fulvia, like an F3 car. It's good. It DOESN'T feel like modern things like Audis with far too much power steering assistance, but they are not designed for sporty driving.
As for feeling suspension and the rear of the car, I can feel the rear in the steering wheel in real life (albeit supplemented by 'seat-of-my-pants' forces) and in LFS (and nKP, but not ISI games), and I can feel the effects of suspension movement (causing a loading of the tyre which translates to steering feedback) in both reality and in game.
If you can't, either you drive rubbish cars (Opels
), don't understand how cars feel (unlikely, as you're not slow), or are so reliant on g-forces that you could be even better in reality by 'listening' to your steering wheel.