Looking at what has been presented here, in general I find this sentient weapon system disappointing.
1. I personally was looking forward to a system that would encourage game play at level 30
2. I don't like the named weapon restriction due to a lack of multiple named item types
3. Browsing the effects I can only see myself using this system between the levels of 21-24 simply due to thunderforge and LGS beating the sentiet bonuses.
4. I really wanted an xp system for sentient that functioned off of character xp at 30 it really does make more sense to me then sacrificing named items, I could see the item scarifices acceptable if it wasn't restricted to named items.
Personally I hope that they don't release the sentient system as they have displayed here, even if they have to delay it to a later update. I would be okay with it.
Also on the note of raiding I have seen many mentions on how this system could affect raiding. For me this system would not affect how I currently raid. I only raid for specific items and then stop I don't see how this system would encourage me to raid at all specially since it only requires named items to level. I would probably just go and casually run trial by fury in the web and collect a bunch of spidersilk robes in all honesty. Or grab a bunch of Drow weapon master weapons from Broken blades. Or just grab a bunch of Golden Guiles. Seriously the sentient xp system as it is to incentivise raiding seems like a joke.