I don't necessarily see all random events as making the game entirely luck-based. Think of it more as an element that you need to plan for. If a majority of a game relies on a single random event (say for instance, rolling the dice in a game of Monopoly), then you really do have a luck element. If three years of WoW raiding has taught me anything, it's to plan for randomness. Most raid boss encounters can be summed up as: random things happening to random people at random times in random places for random levels of effect, and yet, you can strategize around just about all of it. If you truly can't strategize around it, then yeah, it is luck-based.