Played 4 hours of the early access already. Graphics are great, physics seem really good, AI puts up more of a fight without just doing mad crap like trying to smash you at the expense of them taking the corner constantly. EA is lacking in content, but I'm ok with that, means more people are driving the same track + car combos so can get better data for bug testing before adding more variation in. Hopefully they can add more content at a reasonable pace.
I'm well over 200 hours on Wreckfest and suspect I'll easily do the same on Wreckfest 2 even if they don't add a huge amount of content beyond what was in the original. We play so much of it at LANParties!