I just wanted to say that 2h swords in real life are not heavy at all. They rarely exceed 2.5 kg, and some are even lighter than 2 kg. In cRPG, they are too heavy. You have to subtract at least 0.5 kg from most of them to get realistic weight.
And the thing about them being the best weapons...that really depends on the situation. They are versatile, that's true, but in very tight melee situations, they are worse than sword and board, and in formations, polearms are obviously better. In cRPG, though, we don't have formations, and we have hiltslash, so those two situations don't really apply. We also have unbreakable polearms and 1h swords that can hurt through plate armor, so comparing cRPG with reality is not really helpful.