I finished ID's Rage yesterday. My rating would be 6 out of 10.
This rating has a lot to do with the fact that I didn't really expect to finish it, at least not so soon. I made sure that I completed all available missions, and in fact I was just getting geared up to fighting the ominous 'Authority' at long last, when the game just ended and the credits started rolling. The game is much too short. Here you get to the utterly surprising sudden cut-off, whereas, say in Borerlands 1 and 2 for example, the games at this stage just start to get going, and then just keep on going.
I played the game on normal difficulty level, perhaps that was a mistake, because I found it much too easy, and I can't be bothered starting again on a harder level, because there's just not enough variety to justify that. The game has a reasonable amount of weapons, I suppose, but in the end you only need a few of them. I got through the whole game by just using just a shotgun, a sniper rifle, and an SMG. The BFG you get just minutes away from the ending doesn't really count, and anyway it works just like a big machine gun.
One last thing that really brings the rating down: the game is incredibly rails. There's no chance of getting lost or having a choice of anywhere to go. Apart from having a choice of several missions, these are all as rails as it gets, and this I find to be very disappointing. Invisible barriers everywhere.
Anyway, there are 2 main parts to the game: the story mode and the car races (3rd person view). I've just dealt with the story part, now as for the races I must say in advance that I'm not really into those in general. But what we have here is just strange, even in my admittedly low experience. The cars bounce around, skid about in an unlikely manner, seem to inflict and receive random amounts of damage, and even after having got used to the controls, are just not that much fun. But I must be very clear about this: my rating doesn't take the racing component into account that would be unfair because of my personal dislike of the genre. The racing part is not essential here; in fact it sticks out of an ID game as a bit of a sore thumb.
The graphics are quite varied, carrying the apocalyptic atmosphere quite well, even if they are a bit cartoony. The opponents are not very varied, after a short while you've seen them all and any new ones are just variations. I can't really see where the 21 G hard drive space goes to.
If the game hadn't ended so suddenly, I don't think I'd have played it much further, there are more interesting and varied games out there. The Borderlands series, for instance.