Supercruise. Every other part of the game I can see why it's designed the way it is, even if I don't particularly like it. Supercruise though is the design equivalent of someone drawing in crayon with their tongue poking out of the corner of their mouth.
Supercruise is probably the best aspect of this game. Sure, it needs some tuning to make it more fluid and a little faster. But what people don't realize is that space travel takes forever. Even if you can travel at the speed of light or faster it still takes a LONG time. Hell, the theory of relativity makes traveling at the speed of light impossible. But in this game we are able to manage speeds many times faster than the speed of light. Thankfully we're not limited by relativity in this game. I for one enjoy supercruise.
The most boring part of this game for me would have to be mining. I wouldn't mind it if you didn't have to stop and pick up the ore. I've found that it despawns really quickly which just gets frustrating and tedious.