Forced updates
At least with a locally installed application I can decide not to install the latest and supposedly greatest version, in which functionality has been removed, broken or changed so it no longer works the way I want it to. With web apps the provider has free range to change whatever they want.
However, that problem fades into insignificance compared to the lack of privacy with your data being examined on their server. No thanks, Google, not a chance.
Biting the hand that feeds IT
