Damo, I disagree. The problem with Pro Tools mostly seems to be its intermittency. At the moment I have a completely stable system but in the past I've had issues with it sometimes working, sometimes not working, and that seems to be the most common complaint amongst its users. Things like DAE errors upon startup - sometimes they occur, sometimes they don't.
Luckily I no longer have such problems and it runs pretty damn smoothly for me.
My gripe with Pro Tools at the moment is the lack of support for its pc users who wish to upgrade to the latest OS. Windows 7 beta version has been out for a couple of years, and surely they'd have been working with Microsoft prior to its release in order to make things work but they still have not released a supported Windows 7 compatible update. That gives me the shits because they seem to get their shit working with Mac OS updates within microseconds of them being released. Also, all other recording software seems to not only be compatible with Win7 but also 64 bit versions.
Still, I love using Pro Tools. To me it's just really intuitive. Everything on it seems to make sense. It's simple but effective.