I don't think it's a terribly big deal, but I think 800x600 seems to be pretty much standard here when it comes to FPSs. I just think they don't want really high resolution pics because of bandwidth issues. Any image showing combat, lighting, or a key part of the game would be much appreciated (I havn't had a copy of the game in ages). 

If you want to put in a mention of the Co-op mode feel free. There actually wasn't a multiplayer or even gameplay section at all in this article until a month or so ago ;) I was actually thinking of putting a "mods" section in as Doom 3 has had a couple of notable ones.