These are the three best looking in my opinion.

Battlefield 4

http://www.youtube.com/watch?v=LDZgbZs6zvE

Tom Clancy's The Division. I especially like the small touches. One character is in cover next to a cop car with a open back door. While staying in cover moving to the back of the car, the character pushes the door closed with his hand. Windows being shot at shows the glass breaking but not shattering and bullet holes through the glass. Just looks very well done.

http://www.youtube.com/watch?v=uiaRSuyQ7zA

Infamous Second Son. It doesn't release until 2014 so slight framerate issues and ever so slightly pop in on one small part in the video will probably not be in the final version. Most of you probably won't even notice any of this, but I'd say it might drop down to 25-27 fps at times. I'm buying a PS4 as soon as this releases though.

http://www.youtube.com/watch?v=Uibnf_Q_51s

Games mentioned, but not embedded yet:

MGS V



inFAMOUS Second Son



Tom Clancy's The Division



Witcher 3



FFXV

Watch the first 3 minutes in HD. Love it.

Even though this gen won't be about graphics at all, it looks very good.

Most impressive to me is, considering it's pushing 64 players, massive destructible maps and 60 fps on X1, BF4.
Best overall visuals I'd say is either Shadow Fall or The Division.

I don't know honestly. So many games that are beautiful in their own way. FFXV, Witcher 3, MGSV, Killzone Shadow Fall. Too tough to pick.

Super Mario 3D World

There were some truly phenomenal looking titles

I'm only going to list titles that showed gameplay though, anything else is a bit of a misrepresentation

MGSV
Forza 5
Witcher 3
Destiny
Ryse
BF4
FFXV

The Division. Just like last year with Watchdogs, Ubi brings it at E3.

FFXV bar none, that game is a bit rediculous