For me the list is pretty big and E3 was great but my top 3 are
Star Trek VR
I don't need to say much here as I'm a massive Trek fan and I get to play as starship personnel so I'm all in.
Steep
I know this is an odd reason but I thought the graphics on the zoomed out peak mode looked bloody amazing and the emergent gameplay looked like it could be awesome fun with the guys on here.
Ghost Recon Wildlands
While this is number 3 it comes with a caveat. This look great if the guys on here get it and Ubisoft don't decide to throw half the strawberry floating game in the bin on launch as they did with R6 and The Division.
If Ghost recon turns into another Ubisoft disappointment then I will happily replace it with