Probably because the keyboards on Macs are awful. I hate the keyboard on my UniBody MacBook and I hated the keyboard on my plastic MacBooks. The keyboards on HPs are MUCH better.
The glass trackpad is nice, but who uses a trackpad when you're sitting at a desk? I'll take my MX Revolution mouse. Even when I'm on the go, my bag has plenty of room for me to drop my mouse in.
How is 16" not portable? Keep in mind that the plastic MacBooks were only slightly less heavy than your average 15.4" - 16" PC, and were heavier than other 13.3" systems. The UniBody systems are equal to other 13.3" systems in weight.
Who honestly carries around a system out of a bag? The minimal difference between a 13.3" UniBody MacBook and this 16" system will mean nothing considering it will spend it's carried life in a bag.
My real world experience shows that HP's like the one he bought get around 3.5 hours of battery life in a real world situation.
The UniBody MacBook has an integrated GPU with shared memory. I know this because I have one. It's about half as fast as the 9600M GT in the HP he got. Plus the 9600M GPU in that HP has 512MB of dedicated GDDR3 RAM. MUCH faster than the shared DDR3 in the MacBook.
The MacBook would fail because it has a smaller screen, inferior construction (I have a plastic HP and UniBody Mac and yes, the HP is built better), and the GPU is only half as fast at best.
Let's tackle each of these point by point.
1. You're quick to rebut about HP and give your
opinion. Let's state facts in addition to our opinions.
2. Although this is a matter of preference, I absolutely dislike the HP keys, as my father owns one. They are so easy to be popped off, quite contrary to the new MacBook/Pro as they are a part of the frame. Also, due to the fact that the keys are slightly spaced on Macs, this makes: 1. Typing easier because of less chance of cramping (I know this from experience). 2. Cleaning debris becomes less of a hassle. 3. Typing is relatively faster on Macs because (guitar aficionados will know this term) of the "low action". I average 70 on macs, and the last time I checked my gwam on the HP, I got around 64ish.
3. The absolute VAST majority of laptop owners use their trackpad at a desk. This is without question. The trackpad on the HP can not compare to the Macs' AT ALL. To begin, I am extremely picky about trackpad surfaces as I hate it when my finger doesn't "glide" over the surfaces. I have relatively tacky fingers. I experience no problem at all when it comes to the Macbook Pro. Multi-touch gestures really make for a better computing experience. For example; two finger scroll rather than having to moving my fingers to the extreme right of the trackpad just to scroll. Since the trackpad is glass, it will always stay silky smooth despite use.
4. You keep on swaying from the new macbooks to the plastic ones. The plastic ones are past. You cannot fairly attempt to compare the plastic ones to the laptops of today. Pick the right fight, and pick the aluminum. The average 15-16 inch laptop is 6.5lbs. That is without question. You will see many heavier, and many lighter, but that is a good rough estimate. The Macbook Aluminum, and yes even the plastic one absolutely destroy it in terms of portability. You are correct, the UMB is relatively equal in terms of wait. But, it blows them away in terms of of battery life (which is why many of those 13" models offer extended batteries which add bulk, and another pound, yet still don't match the UMB), and in terms of performance. I'm not a great fan of integrated graphics.

Portability is not just about how much something weighs in a bag, it's about having that extra real estate on your school desk (which aren't large by any means), being able to tilt your screen on the airport meal table, or being able to tuck your laptop away in something small. Let's not overlook this.
5. My Macbook Pro gets about 8 and a half hours on light use with wifi and bluetooth off. Apple tells you straight up how it calculates its battery life so as to not get people complaining about less than the purported battery life. They say that the brightness is turned to half and and wifi is on. I don't care how much I lower the brightness, the battery life on most PC laptops does not impress me one bit. I'd have to literally turn it down to almost as low as it gets to even come close to the Macbook's, which isn't close at all.
6. You have made two very [insert any word here] mistakes. Although using shared memory, it is in NO WAY AN INTEGRATED GRAPHICS CARD.

And also, I'm pretty sure you're not tech savvy, as you would have known that GDDR3 and DDR3 are not the same thing. Having a 'G' in the front does not make it more powerful. In fact, GDDR3 is based on the same architecture as DDR2!!!!! I don't think we need to have a DDR3 vs. DDR2 discussion.

Only GDDR4 is comparable to DDR3 as it is based on that architecture.
7. Man, are you just ignorant or are you trying to get people pissed off. The manufacturing used to make others laptops are completely inferior to the unibody process. Apple has made a great stride with this. When playing Crysis, my MBP only gets slightly warm due to the fact that the aluminum essentially acts as a heat sink. Aluminum has an incredibly amazing strength:weight ratio. The aluminum housing allows it to be thinner than many notebooks on the market right now. The frame itself is designed to protect each component respectively. Wanna talk about crap housing, we can talk about HP all day.
8. I'd like to add that HP customer support are aszholes, unlike Apple.

Just my 2 cents.
9. For everything that you own, you will pay for design that put's food on artists' and engineers' tables. Everything we see is geared by design so don't try to imply that design doesn't matter. If quality, design, and performance didn't matter, then everyone in the world might as well drive *****ty cars with faulty lights and dents all over that were bought because they were cheap.
Thank You, and Good Morning America.
P.S.: I think that this is the longest thing ever typed on an iPhone, another amazing Apple product.
Note: I moved this so that this post as soon as I got on the computer so that this post would not die.