The stealth cruiser seems designed to avoid combat, but the stars without ships tend to be so devoid of resources that you'll never be able to beat the end boss if you do so (and I could never afford enough fuel). It also sucks when you're trying for the make it to sector 8 without going through an environmental hazard achievement, but the map layout makes it literally impossible to do so. After reading this thread, it seems like I'm really bad at the game. I did make it to the boss on Easy on my first try and beat him on my second try, but after that it's been kind of brutal. 2 or 3 totally failed run with the stealth cruiser, one decent run where I made it to Sector 7 or so, 2 decent runs in the federation cruiser that ended before the boss (the preceding all on easy), and a fairly short normal run in the engineering cruiser. It's a fun little game, but it might be a bit random for my tastes.