You're leaving out a ton of stuff, maybe you went too fast to notice?
What am I leaving out?
The racing? A lack luster add on that had no polish or difficulty. I rarely ever lost a race and never more than once (and then only the rallys races). Lack of challenge = boring.
The card game? Dull and uninspired compared to other card game mini games found in other games. The time vs money gained didn't make it worth while to play.
The other mini games? Similar to the card game, the rewards didn't warrant wasting time on them.
The hidden stuff? Like I said, I nearly maxed out the obsessive compulsive. I got almost everything done and I thought I would be able to keep running around after the final mission similar to other games like this to finish my search. Now that it's over I could load up a previous save that I made just in case but this ending just took all the motivation out of the search.
Side quests? I did every side quest and job board quest i could find. I often went back to each town after a few main missions to see if there was anything new for sale or quests to do. Never was...
What did I miss out on? Aside from a decent climix and proper ending? I'm not saying we should have killed Cross and perma ended this storyline for good so there could never be a RAGE 2. But there should have been something more challenging and satisfying waiting for you than a dozen or so lolMuties.