I dunno about that. The x1600 or go7700 is about as good a GPU as you can get in a 15" formfactor these days. It is acceptable for WoW and will play it around 15-50fps min/max at the MBP's native LCD resolution. It is well below par for more demanding games like Oblivion or EQ2.
It all puts me in a bind because I'd love to have the gaming performance of a Dell XPS 1710, but I also want the formfactor of the MBP. It's is going to be a tough call for me (I've been waiting, trying to decide since the original MBP came out!). WoW at 40-60fps 1920x1200 max settings is mightly tempting.
If you do read my post from before, you'll see that I generally agree with you. I only agreed with New to the point that I would agree it isn't "gaming-oriented" (i.e. first and foremost, it is not designed to meet the needs of a gamer).
I have seen plenty of people playing Oblivion with fully clocked X1600's, and a 3DMark05 score of 4000 or so definitely would translate to pretty acceptable Oblivion performance in my book. Heck, even the older very underclocked MBP could handle Oblivion with some detail settings turned off.
I think you ultimately do have to decide what is more important. If the weight and size of the XPSM1710 is an acceptable tradeoff for very good gaming performance at high resolutions (although fromw hat I've heard, even with the latest 7950gtx go in it, gaming at native resolutions of 1920x1200 will still tax it.... although probably not WoW).
For me, I've already tried one gaming laptop (the Toshiba P105-S9712, with a 7900gs in it). That one actually was light by gaming laptop standards (7.8 pounds or so), but I still found it to be too bulky to be enjoyable from a portability standpoint.
I will take the 1" thick 5.6 pound MBP and lesser gaming performance any day, I think. I think these big giant gaming laptops are really only good if you do need them as a desktop, but also need to be able to take them around a lot (to LANparties, etc.). Given the price, I would just as soon buy an MBP and then get a gaming desktop, since I personally don't do a lot of LAN parties and the like.