I have spent many years in a repair shop. This is a summary (subjective I admit) of what comes in the shop.
broken hinges - lenovo, dell, toshiba, lots of cheapies like emachines
broken power sockets - lenovo, sony, toshiba, cheap badge makes like emachines
broken screens - samsung, fujitsu, msi, lots of cheap badge makes
broken keyboards - apple, lenovo, cheap badge
broken track pads - asus, acer, occasional dells, cheap badge
broken optical drive - apple, dell, toshiba, cheapies
broken HDD - dell, sony, lenovo
broken wifi - no clear loser
It has got to the point that when someone walks in the shop I can often guess right from the label on the bag what the likely problem is.
On the software side, specifically drivers, if it is a recent model then dell is great for downloading fresh drivers after a clean install but for an old model the detector software often fails. Lenovo is awful for getting any drivers, Samsung is good for recent models and like dell less good for older models. Acer and Asus are both model dependent (even recent ones) as to whether the drivers are available. In general all manufacturers are very picky over which OS is supported driver-wise. If your laptop was released with Vista Basic installed then you are unlikely to find Vista64 or Win7 drivers on the manufacturers website.
In terms of design, any clamshell built model where you have to work your way down through the keyboard, fascia, cables, motherboard etc to get to items to repair is awful, underside access panels are great (thank you dell top-end models and lenovo likewise)
Over the years track pads have got worse with the clickable pads prevalent on Win8 machines being the worst, especially asus and acer.