The list of issues with that game is significantly longer than just "not enough content". To name a few off the top of my head:
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The AI sucks. They're slow, won't react to the player and act in a completely braindead manner. They also rubberband like crazy.
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Offline races are all set up as rolling starts, often with ludicrous gaps to the first AI. You cannot have close racing in this game if you want to win these races, you need to pick something OP.
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Actually there are no offline races because the game is always online.
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There is only one "endurance" race with repeating prize money and even that one's just 1 hour.
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No B-Spec mode at all.
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Grinding money is even less fun than in previous titles - so much so that people wrote scripts using autohotkey and remoteplay.
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Split screen mode didn't work at launch - still doesn't work.
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Lobbies and connections are unstable.
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Lobbies still only have 16 slots.
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Lobbies don't have a separate spectator slot.
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Even if you take a player slot to spectate, the spectator options and UI are extremely limited.
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Car balancing in "BoP" is absolute ass.
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Car physics for MR cars is broken.
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Tuning is broken.
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Tuning parts locked behind daily "tickets".
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No way to increase the tank size of road cars - except by swapping in a race car engine (from one of those lottery tickets).
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The PP system is broken. As a matter of fact, it's so bad they removed all suspension setup changes from PP calculations because it was a buggy mess and people kept finding glitches to enter absurdly powerful cars into PP-restricted races.
Better that way.
The online lobbies are a mess, servers are iffy, the penalty system is an insult to humanity, the car physics are wonky, the car balance is more or less entirely absent, and basic functions are missing.
And by "basic", I mean this is a title meant to have an esports aspect, but there is no spectator slot.
Oh look, an event centered around a task which basically requires you to be an autist and a massive faggot... is overrun by massive faggots and autists.
also
we do not believe it is a safe place for our community
wish it were so in more than just their delusions.
Here he's talking about it, timestamped, 3 years ago.
Democracy moment.
People are taken aback that they're actually getting what they've voted for, for a change. :D