Aside from the fact that I don't like being monetized to death, the biggest problems I have with Google are:
1) ALL their products feel half-finished. They look half-finished, and work about the same amount. It's almost like they stop at "good enough."
2) ALL their products appear to receive changes on a whim, with little regard to the user. And because they're all web services, it's not like you can simply continue to "use the old version."
3) Google has a habit of simply canceling a service (iGoogle comes to mind).
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