Enthusiasm & passion for the medium. Certainly no ones demanding 'this is going to be the best game evar' hollow tub thumping, but a bit more glass half full versus glass half empty wouldn't go amiss. In what is still a medium that is in its infancy its unrealistic to expect games to live up to the hype that often surrounds them, but criticism doesn't always have to be resoundingly negative.
Aside from the fact that almost every gaming podcast I listen too is full of people talking about the awesome games they're playing, it's kind of hilarious when the main criticism of the games press is they're handing out 10's like they're candy.
Journalistic integrity. Not everything in this link is going to be applicable, but there's not a whole lot wrong with using those points as a base line in terms of conduct and behaviour: -
http://www.spj.org/ethicscode.asp
And with that in mind editors, don't be afraid to let people go who consistently fail in that regard. The world doesn't lack for people who can write about games.
I don't actually think most games press have a problem with any of that, especially those actually employed by companies and not dependent on Patreon, but I guess, mileage may vary if being friends with developers is a horrible breach of ethics.
Fact checking. If someone claims something on twitter, don't just take their world for it, do the due diligence and check it's actually the case with a third party. And if you're unable to confirm it, then at least acknowledge that it hasn't been confirmed in the piece.
Again, putting aside this is likely an editorial decision to be "first," most articles I see about BIG NEWS usually has a line about Sony/Microsoft/Company X not confirming the information.
Investigate. Foxes 'well I'm not sure Linda but maybe they are death camps' approach to hang wringing journalism is not the model you should aspire to. When the rumours did the rounds about Origin being spyware I don't recall one mainstream article bothering to establish if it was in fact spyware, versus hollow fear mongering.
There are so many rumors that frankly, I don't know what needs to be debunked and what will flame out on it's own within a day or two. Not every rumor in politics, sports, or so on, is covered by ABC, ESPN, or CNN either. Now, criticize what they do or don't investigate, but also realize that frankly, when major newspapers can't put together major investigations anymore, I don't know how Kotaku can.
Don't second guess your readership.
Don't alienate your readership.
Sometimes your readership is wrong and needs to be told they're being idiots.
No 'No comments'. If you're going to put your thoughts and opinions out there for public consumption then have the decency to expect critical feedback on them from the public.
What if instead of comments (ignoring the fact I can't think of a major website without comments), they said, "no comments, but email a response to
letters@xxx.com and we'll post the best 10 responses. After all, again, CNN shut down comments to their stories because they realized it was toxic.