Well, I've been playing the PC version of the game and from a technical standpoint it's a mess. Inconsistent framerates, texture pop-ins, low-res textures, and id have committed the heinous crime of not providing any video/graphics settings at all, the player may only change the resolution (high or low it doesn't seem to improve the performance either).
I've been using some cvars and +set launch options to amend some of the issues but it's not enough. The game is technically playable but just barely.
RAGE doesn't feel like a total console port, but certain aspects were clearly done in a certain way specifically for consoles e.g. the quick weapon menu.
On the bright side the game does exhibit some glimmers of a quality production such as the high-detail and vehicle character models and the highly detailed environments. The gameplay is pretty fun too but the gunplay seems to have some issues i.e. headshots don't seem to work.
Id really needs to fix the issues A.S.A.P. Fans are already writing this one off as a shoddy console-port with poor PC support.
Despite the numerous issues, I've enjoyed what I've played of it so far. It's an id game with a little more character. RAGE feels like id's vision of Fallout, I even found a Valt-Tec boy bobble-head! In terms of storytelling, id feels like a toddler among adults when you compare it to other games. It's just a shame that the potential for all the characters was wasted as the plot seems to just be an excuse to shoot things, which I suppose is fair enough: it's an id game after all.