I find this odd since I've actually had decent luck with HP. First one I bought, I got used on eBay. It died when it was close to 2 years old (I had it about a year). Fried mobo but it was a super cheap model (brand new I think it was $400). Bought a Compaq after that one died. Again used, but it was only about 2 or 3 months old when I got it. I bought it from a friend who worked for BestBuy. It was already a cheap model (bout $450 new) with a RAM upgrade (had 512MB to start, he added another 1GB). Only major factory issue I ever had to fix was overheating. Fresh Arctic Silver 5 fixed that. After that I broke the LCD and replaced it. I've had it 2 1/2 years. My dad uses it now (still runs like new). Hell both batteries (which one actually came from the laptop before it) still hold 2 hour charges despite their age.
I now have another HP which is stouter and more expensive ($950) than my old one and I actually got it new this time. But not before having to return and trade a defective Toshiba for it. Within 30 minutes of using it, the Toshiba I had at first overheated and locked up. It wouldn't boot for a while. I let it sit for an hour and tried again. This time it booted and I found a way to keep it cool, restored it to a factory state, returned it the store I got it, paid an extra $50 and got the HP. It doesn't overheat, has reportedly better batter life, bigger screen (17" vs. 16"), Blu-Ray, and a frickin remote 😛 (actually I use it a lot since I have a tuner card and use it for TV in my room). The only real trade off was the Toshiba had a dedicated Radeon HD3650 I think while the HP has an Integrated Radeon HD3200. Still it can play TF2 without missing a beat so it's all good.
I've never really liked Dell cause I've had to work on quite a few for people. I've encountered multiple battery failures. In fact, my friend only had her laptop a year before her battery became completely nonchargeable. Like I said before, I've got 2 HP batteries (1 nearly 3 years old and the other around 4 years) that both still hold at least 90% of the original capacity. The Dells also seemed to have relatively poor build quality.
I built my main rig with an ASUS board. It's been nothing less than reliable. When I have money again and I want another laptop, I'll very likely get an ASUS since I've heard a lot of good things about them. They also seem to be good value too. Looked at one that was $1500 and I guarantee you it would cost $1700 or more from someone like Dell or HP.
As for the others, I've always heard bad of Acer's PC's (but the displays are alright), I've heard crap about Gateway quite often, don't really have experience with Lenovo, Apple can suck it, and I've never really dealt with Sony but they seem good.