Wow, I hope you didn't pay for the expansions if you're bailing this early.
I think many are just burnt out on the formula itself, regardless of how well done this game is (or isn't to some) it was always going to happen.
Personally were it not for mainly Goliath and testing the Trial options I'd only be checking in weekly for the playlist already too, I tried to do something with almost every car in FH5 so most of what's available at the moment I've already experienced in the last 1-2 years and know it is very likely to be one of 3 things, buffed because it has a cent supercharger, crap because it already was in 5, or good in 5 but weakened if it used a non-cent engine or relied on the 6.2L V8 swap since that engine is a different one for this game that is a lot weaker + missing the cent, just the horrible balance in general is a turn-off sometimes, the 787B is a Gran Turismo 3 childhood memory for me but I think R class was shoehorned in almost entirely to justify that 1 car being added, and I think it's the biggest cause of said balance issues, they'd have been much better off making R 999-1098PI.
Unless someone wants to drive racing cars all the time too there really was a surprising lack of brand new cars at launch, and sadly some of those are the game's biggest sweatboxes (cough cough Beat, City, '86 Civic) or completely useless (the Honda E is possibly the weakest car in the whole game, Nissan Gloria is rubbish, Montero 2800 seems to be weaker than the Evo version in every aspect), yeah I get it's set in Japan but there's barely any new European cars, and I think the '23 Acura Integra is the only genuinely new American car so far, any others are either fictional (FE cars), slight variations from previous games (Acura Integra is now an '01 instead of '00, the NSX is an updated one from the '17, Jeep JT is just what was called the Gladiator in FH5) or have been in Forza before (Dodge Ram, the RAM 1500 was in FH4 as a concept version).
I straight up don't like a lot of the track design either, too many are brainless power or ruin a good course with a long section of it to the finish line, half the Dirt sprints seem to do that and use far too much tarmac (I mean look at Airfield Trail in that Trial at the start of this series, a Celica on stock tires was the fastest option, or me being able to very briefly sit at #1 on D Gauntlet's board with a stock tires 240SX), but then other sections across all race types are made stupidly tight and narrow, as if they were somehow unaware that they could be a rammer/griefer/moron's wet dream in co-op/Trials.
It feels like PG have basically gone 'Well we've finally given them Japan' then half arsed everything else, and hey I get it to a degree, I know it's not nice to say but most of this game's player base are shallow, fake or plain stupid, it's an attention seeking simulator to some, others just want something pretty to gawp at, it's a mindless time filler for another section, and it's a place for others to create a false persona and little fantasy bubble, it sounds harsh and insulting I know but when you see some of the people who gather a following in these games you cannot draw any other conclusion about the wider community, many of them would get nowhere if the game's community was a good one with a reasonable understanding of + interest in the core mechanics.
It's not an EA Sports situation yet where the games are terrible but they know there's no alternative so no reason to innovate or polish them but FH could really do with some competition to stop PG/MS getting too comfortable, maybe Clutch will provide that but not convinced personally.
FH6 is a great game, yet at the same time I don't think it's close to what many people in 2014 playing a brand new FH2 would have envisioned 12 years of advancement from that looking like.