Easy to learn; difficult to master; even harder to stop playing. I have 400+ hours on PS4, and didn't hesitate to buy it on PC as well.

You can pick this game up and instantly be able to participate in a meaningful way in online matches, but the game will push you to progress along with your competition. You will start out celebrating a goal, then celebrate a backflip goal, then celebrate an aerial goal, before celebrating a backwards/upside down/freestyle/aerial goal.

Matches have a 5 minute timer, and so you end up saying "just one more game before bed" until you realize it's 2am.

If you have friends I definitely recommend bringing them along the learning process with you. If not, then you can meet plenty of nice people from within the game.

UPDATE 1 (11/2016): 1000 hours in the PC version now. I also have the Collector's Edition for XB1 and PS4 now. Nominating this game for a Steam Award.

UPDATE 2 (11/2017): 1500 hours on PC, untold hours on Xbox and PS4 both. I play this on all consoles - it's that fun. Nominating for steam award.

UPDATE 3 (11/2018): Honestly I'm just editing and nominating this game for an award again for the easy badge. Microtransactions rule the day in rocket league now, although at least it's cosmetic only unless you count the loot box vehicles that have variatons of hitboxes.

Edit: 6/2019 for steam sale points

Edit: 11/2019 for steam badge

Things this game lets you do:

• Meow incessantly, for no reason at all
  
• Jump on keyboards and spam gibberish on computer screens
  
• Knock everything imaginable off edges. Coffee cups, glasses, bottles, pots, etc...
  
• Scratch up and ruin couches and furniture
  
• Run between people's legs while they're walking, and watch them face plant on the ground
  
• Meow through entire cutscenes
  
• Jump inside and hide in cardboard boxes
  
• Curl up on top of a robots lap and go to sleep
  
• Never stop meowing
  
  Edit: nominating for a steam award