Resoulution is an issue... but as they've mentioned they work on it and I'm sure they're going to improove on that. Resolution isn't that much of an issue these days where screens got smaller and higher resoluted (like the retina display froma apple for example). It's just a matter of time and it's still a dev kit right now.
But people who had've the chance to play Doom wearing the device were unanimous stunned. Even with low res.
I'd rather "be" in a pixelized game than "look at" a high resoultion monitor (I'm that excited about this
).
Time will tell, but I'm very optimistic!