While its NOT glamis... I will give my opinion. (for what ever thats worth) I'm moving to Vegas myself and have been to dumont 5 times in the last 2 months.
I've been to both Mother G and Dumont. Yes Dumont is smaller, but it makes up for the size in hills, bowls, and just kick ass riding. Since its smaller there are less people there (off weekend) Any big weekend will be chaos in either place.
What John was trying to explain above is its mainly Razors in Dumont where Mother G has a lot of rolling hills. I've had many people in the past tell me that Dumont is very dangerous and not for amatures. While I may agree with that I look at it as predictable. If you acknowledge that almost every hill you climb is a razor then you dont have to worry. Approach all hills as a razor and with caution. But once you get to know the area,,, Its hard to beat.
I'm not saying its better or worse than Mother G, but being that its 100 miles from Vegas... How can you go wrong? If your into the party scene, and actually enjoy hanging out with the crazies... then Mother G is for you.
Here are some pics from RF04 http://www.roostfest.net/images/ride%20trips/roostfest04/