TNecron one looks about like what we've been seeing from the Necrons.
The marine is bleh. Good for parts, but looks like a smaller version of the storm-brick in the BA and GK codex.
But the ork one looks like crap in my opinion. I don't like the excessive use of rounded panels, or how it pretty much just looks like someone took a generic jet-model, added a (very small) handful of rivets, a random pipe on one side, and called it "ork plane!" Personally, the thing should look like an excessively riveted nightmarish death-plane (the plane that deaths you), and is fed a diet of large herbivores and tanks. And personally it shouldn't be a "hurr 3-in-1". All that means is they didn't bother to give it any options in the rules, and are instead shoe-horning the players into using one of 3 stock builds... Though given the bland mess the Ork codex is currently in, that's not surprising to me in the least.
Overall... my rating for the Ork jet is "half a jar of mayo". Good for parts, but needs more rivets (and teeth).