Its much more than fun. Its plain awesome! And looks damn good too.
To me, the bad is really lack of certain menu functions, all minor things. I have not noticed any other flaws or issues while playing. The texture pop-in is not noticeable for me during gameplay but if i stop to look for it, yes its there. I'm sure it'll be fixed.
About the over birghtened shadow areas with greenish hue, i found that by lowering the game's brightness slider well down pass visibility of that reference rage logo, it actually looks pretty damn good. Still green though.

The recommended setting in game is much too bright imho.
Good job on Rage
