Yesterday Raef and I hooked up our 360's in his house for emergence day and solved the game from beginning to end on Hardcore.
Took use 10 hours (excluding breaks). the game was so good, we just had to try Insane mode for "just a second", 1.5 hours later, we forced ourselves to quite. I scored the "I just can't quite you Dom" achievement.
The bad guy AI is just off the hook on insane. They very rarely miss, and they pop up for only a moment, you really need to flank the heck out of them.
Favorite moments? Getting my first grenade sticky kill on a Boomer! "Boom that ya B*tch"
The co-op mode on that game is so much fun, I had no desire for deathmatches or anything. I'd be happy to hop in and help anyone on any level, as long as it is at least Hardcore difficutly. Casual is just no fun because enemy AI is too dumbed down.
The down side to Gears? It has ruined me for other games. I watched the Call of Duty 3 trailer last night after I'd solved Gears. I was suprised as the first thing I thought was "wow, do those graphics suck". In truth, COD3 graphics are pretty nice, it's just Gears has set the bar so high, after playing it for awhile, it's hard to go back.
I also tried the R6: Vegas demo. Graphics were better than COD3, but the environments still weren't as lush as Gears. Also, I felt like my feet were stapled to the floor. Gears just lets you move so dynamically, old style FPS movement feels slow and clunky. Also, the R6 controls felt needlessly complicated. If feels like you can do ANYTHING in Gears, but the controls are very simple. This drove home the idea that Gears is great not just because of graphics, its a total package game.
The only negative thing I can say about Gears is that although the Co-op online mode is PERFECT, the multi-player 4v4 team combat needs work. Connecting to a host is tricky, and it is tough to set up a game with your friends.
According to GameRankings, Gears has already scored 7 perfect 10's from various review websites and mags. My only question is "Why so few?"
This game definitly defines what "Next Gen" means. If the PS3 and Wii get titles as sharp looking as this, then we as vid-gamers are all winners.
A note about difficulty levels: It seems to me that the boss fights are about the same regardless of difficulty. The level really effects enemy troop AI, and how effectivly the flank, how well they use cover, and how accuratly they shoot.
Here's my pile 'o achievements:
http://live.xbox.com/en-US/profile/Achievements/ViewAchievementDetails.aspx?compareTo=Red%20Toof&tid=%09%5d%3a%15%18*iAs%05
By the way, if you solve an "Act" on Hardcore, you also get the achievement for "Casual" so there's no reason to play the game on Casual unless you just can't take the heat.