I'm thinking free-roaming rpg with rts elements. Like, imagine a game like Oblivion, except you can join the Imperial Army and go off and fight wars against other races. You start as a soldier charging into battle, and work your way up until you're actually planning the battles.
I'd have to say a free-roam FPS, good graphics, decent storyline, with a level-up system, skills, etc. Also like Ellame said there could be battles between other people online or against the AI.
I'd like something survival-horror and free roam, (not Alone in the Dark style!) with maybe a bit of a slow and lame and short campaign, but still plenty of gameplay outside of campaign. Essentially a modern day Fallout, in urban environments, with zombies. So, I guess that's like if Fallout 3 and Left 4 Dead got merged. And I want difficulties that progressively more challenging, but never leave the realms of possiblity. There should be a mode so easy grandma can play it, and a mode for veterans. Nothing uber-harsh like Gears of Wars Insane mode, (reffered to as Co-Op mode by many people!) because that was just stupid. AI retardation shouldn't factor into difficulty too. I notice Dom and Sheva kinda get a bit 'tarded in higher difficulties, which removes the whole fun of the co-op.
RPG. Free Roam set in modern time, like inFamous, cause you can climb buildings. Even though Graphics don't matter, I'd like to have awesome graphics. Excellent Story. Challenging. Co-op.
Re-encarnate monster rancher 1, but u can do the jobs by yourself, explore whenever u feel like, and make battles feel more like a fighting game, less like an rpg, That Be The Perfect Game! Ive had monster rancher 1 for 2 days and Ive already wasted 10 hours of my life on it!
A story driven RPG set in a fantasy world like Fable 2 but darker with more characters. It would have free roam elements, great graphics co-op and online.