It'll be between Doom and Hitman. Doom is the clear favourite, but between Brad and Dan adoring it and Jeff and Vinny taking a liking to it, Hitman's a real contender.
I think you might have it flip-flopped. I think Jeff and Brad were the highest on Doom. But Jeff, Brad, Dan, and (as of late) Vinny were all high on Hitman. I think Jeff and Brad liked Hitman enough to have it place ahead of Doom, if Dan and Vinny push hard enough for it. Plus, I think Drew and Jason, from their time watching Dan and Brad play Hitman, have taken a liking to it.
top 3, order i dunno
doom
titan fall 2
hitman
I think it'll go: Hitman, Titanfall 2, Doom. I placed Titanfall 2 ahead of Doom due to being fresher in their minds. Inside will probably make it. Can't forget about The Witness. I'm sure Brad will push hard for its inclusion. Uncharted will be charted. I think, Ratchet and Clank has an outside shot, especially now that the PS4 Pro patch is out.
Here are all the 5 Star reviews Giant Bomb has given this year:
Titanfall 2 (Jeff)
Inside (Brad)
Doom (Brad)
Uncharted 4: A Thief's End (Dan)
Stardew Valley (Dan)
The Witness (Brad)
Of those, I think Stardew Valley is the least likely to make the site's top 10. Not because I don't think it's a deserving game, but because it only seems Dan (who reviewed it) was way into it. It'll definitely make Dan's personal list.