I'm not that big on 3D effects. The 1st 3D movie I saw was Avatar at a Sony IMAX theater and the 3D effects wore off on me in about 15 minutes.
Based on the reviews of the Asus monitor, people generally seem happy about it. The only complaints have been about dead pixels, but even an expensive professional level IPS monitor can have dead pixels. The difference is that those professional monitor generally have a "Zero Dead Pixel" return policy since they generally cost in the thousands of dollars.
Is 3D for you? That's for you to decide. As an analogy, if you really like watching 3D movies, then chances are you will enjoy 3D gaming. If you have an AMD/ATI card, then just be aware that setting it up for 3D is a bit more difficult than with an nVidia card and you will need to buy 3rd party drivers for it.
Gaming in 3D will also need a powerful enough video card as well since you will take a performance it.
Based on comments of 120Hz PC monitors owners they say even if you do not use a 120Hz monitor for 3D, gaming is a lot smoother since up to 120 frames per second can be displayed if your video card is powerful enough. Just to clarify, that is not my opinion.