When I played PAIN for the PS3, it was mostly just a fun little time waster that I would play for minutes at a time before I either managed to pull off the stunt that I had been trying, or I realized I had other games that I wanted to make progress on.
Turbo Dismount is a lot like that. Unlike PAIN, however, I found Turbo Dismount more entertaining.
PAIN had optional objectives that you could complete at any time to unlock a few things here and there, but any sort of objective or unlock system makes screwing around feel kinda weird and almost unenjoyable. You feel like you're not accomplishing anything, and there are things that you might want but you won't get by messing around. PAIN also had an immature sense of humor (using a donut shop to make ♥♥♥♥ jokes? Seriously?) that just turns me away for some reason.
Turbo Dismount on the other hand, has no objectives or unlockables. In other kinds of games, this would be a VERY BAD THING. But in a game like this, it works really well for some reason. Choose a level, select a vehicle, and hit the accelerator. And hocus pocus, just like that, you've caused a major traffic pileup (you jerk).
Another great part of Turbo Dismount is how smooth the replay system is. The replay system in PAIN is oddly awkward to use for some reason, but Turbo dismount somehow gets it incredibly right by giving you no controls other than playback speed and camera movement.
Turbo Dismount also features dismemberment (that is not at all gory, because the characters are pretty much just crash test dummies), which makes everything SO much more satisfying. You'll find out what I mean when you ask yourself "wait, what happened to his head, and where's one of his arms?" then you realize that you have no idea when he lost his head/arm, and you don't know where they went. And that all works really well with the replay system, because you can find out what happened to said head/arm.
Turbo Dismount is just a fun little game to waste time on.
Another thing: this is just a more interesting version of Stair Dismount, which you can grab for your smartphone. But this one is WAY better.