Re: Reliability of moving and turning
Yep, this is exactly correct. The Robot Virtual Worlds are running a simulation of real-world physics. In building our Robot Virtual Worlds (as well as our other products), we try to find a good balance between exposing students to the challenges involved in mobile robotics and providing enough structure so they don't become overwhelmed.
It sounds like you're using Virtual NXT*. We should have a new release out soon that improves the reliability of the movements somewhat. Watch http://www.robotics-academy.org/blog/
for the announcement.
* If you're using ROBOTC: If you haven't already, try using encoder-based movements instead of time-based ones. This will improve the reliability of your program. If you upgrade to ROBOTC 4.10 and the version of Curriculum Companion that comes with it, you'll also have access to nMotorEncoderTarget moves. We'll be rolling out these updates to the rest of the Robot Virtual Worlds shortly.