Personally, I don't mind the THAC0/DAmage bonuses myself, just the bonus to the Speed Factor. I'll buy that enchanted weapons can be semi-sentient enough to locate their target and instictively improve the aim while they're already being swung/launched, but not that they have decreased overall mass, so that they can be twitched about super-fast. Besides, the very point of small, light weapons, like Daggers and Short Swords, is that they have such low Speed Factors, they will almost always get the first swing--or the first Backstab. But if weapons like Bastard Swords and Warhammers have a Speed Factor of 0, just like Daggers, then the lighter weapons are essentially made obsolete.