It's still in beta, I'm sure people will realise that there is plenty of time to improve. But seriously, people are expecting far too much for an MMO, especially with this "Mega-server" technology - having high detailed graphics would be very intensive to render in high traffic areas. That's not to say the detail may not have been up to the last, and the quality of the video wasn't that great.
All I'm hoping is they can still keep intact with the feel of Elder Scrolls and not turn it into a complete MMO - what I want is like Skyrim but with people to play with. This doesn't look exactly like it would feel that great to play - When I play Skyrim, it feels like you're actually there, as opposed to the graphics of Morrowind, which reminds me that I'm still just sitting in front of a computer, something which ESO seems to be doing.
Anyway, enough rambling, this will surely be forgotten by release, people will still buy it.