It's pretty clear what has happened, tbh all they cared about was getting pre-orders in, they knew they'd be releasing a unfinished game and they knew reviews would be bad and they knew the community would go ape****.
These are professional people, they knew they had a turkey, and they knew other people would fix it over time.
SEGA doesn't give a ****, they'll have made a fortune on pre-orders, what happens sales-wise after that is just gravy to them. After all, who is picking up the pieces? - CREATIVE ARTS.
This was a masterful example of a PR at it's best (worst) they hyped the game, they pumped out vid after vid that bears no relationship to the game they released.
It's a bit like Apple, they have got a captive audience, people have fallen in love with their pretty products and will pay a premium for their phones, tablets, and their awful Mac's - it doesn't matter that other products are cheaper/ better or have more features.
People are addicted to I-W*nk.
On a much smaller scale that's what happened here.