I wouldn't say amazing. ASUS builds a quality notebook. The issue I've had with them is that for whatever reason, they never put a real good video card or harddrive in their machines. It's the little things they do that make the machines "adequate" for the task, but never "great". That comes with a GeForce Go 7700. While adequate for most gaming needs, it's not exactly going to blow you away. Also, typically ASUS uses a soldered gpu solution, so you can't upgrade. 15" monitors also suck for gaming, but are great for portable.. Weird one is their G2 model with the 17" monitor uses a worse ATI x1700 graphics card... Also note they use a 5400rpm hard drive instead of a faster 7500rpm but you could upgrade that.
But the price of $1800 is a good deal, and Asus does a great job with the bundle (asus 3 yr warranty, nice mouse, carry bag, etc). What you'll end up with is a capable rig, but not a truely great gaming rig. To put it in perspective, my 4 month old notebooks scores 5600+/- on 3dMark06, while that soon to be released Asus G1 only did 2600 after overclocking...not even half as fast. But mine set me back an additional grand... Speed cost, so how fast do you want to go?
a review on it http://www.xoticpc.com/article_info.php/articles_id/25