Yeah, the cars are dead stock and not too powerful, so it's a little numb.
Can't imagine it'd be much fun, in addition to that, to race against others with the handicap of just a mouse and/or keyboard, though.
If you do have at least a gamepad (I picked up an xbox controller and changed the connector to usb in 5min.), it's not too bad. Only bother is I haven't found a way to make the trigger analogs separate axes so as to have brake and gas separate.
There's a new tire model patch sometime in the near future.
It should be at least as good as GTR, in terms of gameplay, when it comes out.
Tried the S1 full game, and it's promising.