We love to eat them this way too. I find it easier to cut them in half, core and then slice thin. They cook in no time and taste wonderful. You don't have to add onion... just have lots of yummy browned butter ;-) My girlfriend suggested this cooking technique, now I'll never go back to "oven roasting" them. Too bad most people think they need to be cooked whole or halved.
Believe me, 4 stars is good for brussel sprouts from me. I ate them, I even enjoyed them. I think you're right, Akikobay, the core must be the bitter bit. Also I prefer stir-fried cabbage to boiled cabbage. This achieves the same thing. I had these brussel sprouts with plain rice and a lovely steak with rosemary butter. Very simple but great flavours together.