I am a returning DayZ (mod) player, my old crew got together starting around a week ago and here are my thoughts so far:
Pros:
Game runs smooth as butter.
New Controls/Character movement is greatly improved.
AI seems better along with more consistent loot spawning.
Cons:
Since returning, we have managed to fully repair 5 cars. All of which have failed massively because of ridiculous bugs. It's a shame vehicles weren't fixed before the game was "released" as it's a pretty big let down for me. Every single vehicle would either kill us instantly upon repairing and getting into the drivers seat. Or blow up in some other stupid way, usually killing the driver.
Overall: If the devs follow through with everything (which the community seems skeptical of) this game has HUGE potential. In general it is a major improvement from the old DayZ mod days. Really sucks that cars would be released in the "official release" of this game, in their current state. I would rather they had been left out completely.
I will probably take a break now and keep up on the patch notes till I hear something about cars being fixed.