I just came back to Kerbal after a couple of years, and with the tutorials and info other info i am finding, it is mostly unplayable. I used to enjoy successful trips to the Mun and Minmus, and now after 8hrs with a current version, I can't successfully even orbit Kebin and return safely. I appreciate the physics upgrades, but with little info to go on and such tight tolerances, I am no longer finding Kerbal to be fun. I will check back in a year to see if has been refined to include a more casual mode and useful instructions.