TrackMania -- I recommend Nations Forever if you're starting out; it's free and Nations was the "meta" environment (different environments have different physics) for a long time, so there's a fuckton of custom content for it.
As for what it is: it's like the racing genre's Quake equivalent. It's also like super hot wheels. And it's like Mario Maker. You make all kinds of crazy tracks with it, like Mario Maker. The tracks feature all kinds of wall rides, half-pipes, jumps, loops, and so on, with nothing more than inertia holding you to the track; like hot wheels. And finally, like Quake (and Mario Maker), the high-level players are bat shit insane.
This is the game where you get people who can hit a jump at just the right angle so they thread the needle through a series of holes barely larger than the car while travelling at speeds well above 300mph (welcome to TrackMania, I don't think there's a speed cap). They also do it using keyboards. Seriously. High-level TrackMania players use keyboards, not gamepads or, god forbid, racing wheels.
All of that said, no pressure because you're mainly racing yourself, even in multiplayer. You're trying to get the best time on a track, and multiplayer is basically the same, except your time is being compared with everyone else's. There isn't even any vehicle collision (strangely, there's an option for it, but it doesn't seem to do anything).
Play TrackMania. Is fun.
Huh, I was under the impression that high level players used keyboards and that gamepads were unusual. I was almost certain I'd read that keyboards were considered better because they were full-on/full-off instead of analog; the logic being that it let you respond faster. Where an analog stick would have some ramp-up time when you switch directions, a keyboard would register a full press the moment the key is pressed far enough to complete the circuit. Meanwhile, the physics of Nations were made with keyboards in mind, so analog controls wouldn't offer that much of an improvement.
At least, I was sure that's what I'd read.
Edit: that may have been before TrackMania 2, I'm not even sure if Nations supports analog controls. I haven't played any of the games after Nations/United.