The Gmail Web Calendar has many good features I agree.
But, the Android Calendar would be much better if it would work with other calendar servers besides Gmail. If google called the Android Calendar the Gmail Calendar App, it would be more appropriate. But, this current default android calendar app doesn't use the CalDav protocol and only works with the gmail calendar. This is very peculiar behavior and not what I'd expect from google.
It shocks me that the default calendar for android does not interoperate with any calendar server except gmail's (unless you can shoe-horn events in with a separate caldav app.)
But, the Android Calendar would be much better if it would work with other calendar servers besides Gmail. If google called the Android Calendar the Gmail Calendar App, it would be more appropriate. But, this current default android calendar app doesn't use the CalDav protocol and only works with the gmail calendar. This is very peculiar behavior and not what I'd expect from google.