I was pretty salty at Witcher 3's performance because it didn't scale well on Kepler cards ^^
I had 40fps on Ultra and no matter how far I went down, it always stayed below 60...
Witcher 3 is so far the only game, that wasn't able to reach 60fps, while all other games as GTA5 are able to run at very high at 60+
there were tons of complaints on Nvidia forums about this Kepler issue and it really ruined the game for me :/
the graphics itself look really good, but so do the Fallout 4 videos in my opinion 
I actually care more about having 60fps, than having great graphics to be honest
and it's actually hard to have an 'underwhelming' gameplay in my opinion ^^
it's a Fallout after all... even if it would be another F3, New Vegas game in the same engine, it would still be an amazing game and would still beat most of the other games for me
they have already shown a lot at E3 and I don't really want to see more quests or locations, before having played it myself :/