Yup, assetto isn't so polished as forza,but you have to think one thing!
Forzas are first party studio games, so you have more than 100 people with a good amount of money support and technical support directly from Microsoft, doing the game only for 1 platform (till now an in the case of forza 6 and below)
Kunos with assetto are kind of a indie developer and 30 persons for 3 platforms.
Even with that they where able to port the physics, FFB and sounds like they are in pc and with the Game stable without crashes or big bugs and issues... So for me it's impressive, and like they said, it's just the beginning and the basis..
Let them time to improve, fix and add things.
When the support finished, than can we really talke about what they did or didn't.
In case of an other multiplatform, project cars,it was launched broken, with crashes, lots of issues and game breaking bugs.
They're improved the game a lot, but it's still broken and left the console users without support and two paid DLC tracks broken and useless (mostly online)
So...from my part,i hive kunos my confidence, they released already a game in better state as the Wookie game and with awesome physics..
Its not fair compair big first studios against little multiplatform studios that even got a huge financial state.
Like always, it's my opinion and you're free to agree or not