Spark 3, and the entire Spark Series, managed to give me something I haven't felt in a long time:
True Fun, not "Playing to kill time" or "Feeling like a chore", but genuine "Back from school and booting up the GameCube" fun.

-Spark's controls are tight, responsive, and momentum based. You'll have to build up your speed and try to maintain it in meticulously crafted levels that you'll want to revisit to either explore places you've missed, or find better routes to score a better time. You can also gain powers that will help you zoom across these levels faster and smoothlier.

-The combat system is very simple but deep, unexperienced players might just spam X and Y on the ground, but once you've unlocked all moves and Jester Powers, you're up for some Devil May Cry shinenigans, trying to juggle for as long as you possibly can in the most stylish or cheezy way. Do not sleep on the Data Base as it contains everything you need to know about your abilities and moves.

-Everything in the game is predictable and consistant, from the way the physics and gravity works (running down or falling on slopes makes you go faster; jumping up slopes makes you jump higher; you can run on every wall if there's a slope against it; etc), to the satisfying rail grinding that has generous hitboxes for easy landing and non-risky rail switching, not a single time the game plays for you or locks the camera in any way, you're always in control. Basically, it's almost never the game's fault if you fail.

-The story is servicable, being a direct sequel of Spark 1 and 2, you might be confused with what's happening so it's preferable to give these games a go first (it's worth it), it might not click with you and you are free to ignore if you're not invested, however, if you did play Spark 1 and 2, brace yourself. Personally, I really enjoyed the narrative and characters, even had a strong moment of hype that made me stand up, and am now absolutely looking forward a sequel.

TLDR: If you've played the Sonic Adventure games back then, and want to feel that thrill you used to have from the Sonic and Shadow levels, minus the jank and frustration from unpredictable controls and annoying cameras, go for it, you're going to have the time of your life.