T-shirts vs. Shirts

Is randomness insignificant? There have been instances, and not just once, where a mage with 20 hit points could defeat a fully armored dwarven berserker with a stick. Of course, it's all about my skills and experience, right?

At 160% randomness, nothing really changes. You can still easily gather all the necessary resources on the first map. That's why people play at 160%; randomness plays a much smaller role there. At 200%, it can be decisive, but only in rare cases with unfavorable conditions (small resource spawn/strong guards). As for some poor map design where you can only get gems from a leprechaun, I'll have to think about whether it's even worth playing, let alone playing as a mage.