well, it's like anything else. you try to cram more and more into a single unit and quality of individual tasks starts to diminish.
then you include corporate dealings and you suddenly have things like facebook apps and skype and others that can't be uninstalled and run in the background constantly because they paid verizon to bundle it with their software package
I've owned laptops that don't browse the web as well as this phone does, and digital cameras that don't have a tenth of the quality as these phone pictures. But I've never had a phone that decides it has to reboot because it can't handle more than 5 minutes of being used as a phone, or freeze because I pull the phone away from my head to check the time and it has to switch the screen back on. Or my personal favorite, rebooting if I get a text while on a call, or get a call while typing a text