Rage is a fantastic game and worth a play through.
But you have to know what you are getting here.
The games top value IMO, is its graphics. Rage is an unbelievable looking game. When it was released, it was the best, nothing even came close, looking game I had ever played. And I had the 360 version to boot. The art design, the polish, the animations, the blood decals, the weapon skins. All just fantastic.
To me whether Rages gameplay held up or not, it was simply a piece of gaming art with an amazing soundtrack. That alone to me makes it a must buy.
The gameplay is slight RPGish. You drive in a mostly open world environment to other towns. Once you goto that town you meet people, do small odd jobs and tasks.
The gunplay is amazing. Its so smooth, the weapons pack a ton of punch and the gore effects are great.
The only thing the game really lacks is a story that holds up at the end and the levels are linear... but then again this is 2012. All games are linear. This isnt Doom.
Also to those that say its short. It is sorta short. However just like Mass Effect, if you just do the main story you can kill it in 10 hours or less. If you do ALL the side quests (which is the fun part anyway) you can easily extend it by double. So make sure you do all the side stuff, races etc.
For $10 Im most likely going to snag another copy and play through it again. Was so well worth it. For us older folks (ok 26 isnt insanely old but it feels it in game years) its just great to have seen ID software release something.
But again its not a game in this current era and generation that will appeal to everyone. I just looked it up, got a 81/100 on metcritic which is actually higher than I remember. Im thinking you teenage kids these days probably wont enjoy it much