There are still many games left to check out, but I have managed to check out a few of them first-hand. During a visit to EA's booth, I played both Dante's Inferno and GI Joe: Rise of Cobra. While I waited for a long, long time to play Brutal Legend, I didn't actually ever get my hands on the controller, although I did get my biggest exposure to the game yet and came away with some solid "eyes-on" impressions. More on that later though.
Dante's Inferno: If you've followed this title at all, you've heard the comparisons to God of War. You have no idea. Dante's Inferno steals from God of War so nakedly people walking by the booth called it God of War on a regular basis. It looks like God of War, it plays like God of War, it even sounds like God of War. Killing enemies rewards you with glowing orbs that power you up (just like in God of War) and you can use the currency orbs to improve your powers (just lie in... you get the picture). The only real differences I felt between Dante's Inferno and God of War is that Dante's Inferno lacks GoW's helpful defensive roll move, and there are "magic" and "boost" modifiers in Dante's Inferno that I never quite figured out. Also, the game is brutally hard. I died multiple times against a blobby mini-boss, and all around me the consoles were constantly flashing to the Game Over screen as players bit it. One EA dev team member admitted that the current build of the game was much too difficult.

GI Joe: Rise of Cobra: Man, this is the slightest game I've played in a long time. You run and shoot, that's all you do. That's a lot of games, right? Well, they're not this simple. Auto-targeting takes care of aiming, so really all you need to do is move your character in the general direction of danger with the trigger held down and the game does the rest. Between the ultra-simple gameplay and the frankly shitty graphics, GI Joe feels more like an iPhone game than a console title. There was a reason it was the only game in the booth with no line.

Brutal Legend: So, I didn't play Brutal Legend, but I did see a long chunk of gameplay, including both melee combat and driving. As I suspected, this is a game that will find its fanbase because of the script and setting. As a game, it looks just like any number of action games you've played and already forgotten. The combat seems very simple, with button-mashing the only real strategy. Driving is also pretty standard, with a gas and brake and no way to look behind you. Some of the visual look nice (a pathway of skulls looked surprisingly good) while enemy characters seemed to float off the ground, collision detection, pop-in and tearing were common. Brutal Legend still has some time to be polished up, but not much. I'm more convinced than ever it will be a good game, but far from a great one. Hopefully I'll actually get my hands on it soon and playing it changes my mind.