Is Picasa really good?

Is Picasa really good?
I like Picasa when I use it. In some degree, it's user-intuitive and not difficult to use.
But I think Picasa web/client program still have room to improve....
Can I add widgets in my Blog?
Can I see web albums in the Picasa client program, and just drag pictures between local and online folders/albums?
Can I set how I wanna display my pictures to my friends? Maybe by writing scripts?
Can I put other friends' albums in my albums? Just like connection of Linkedin?
...
Well....but, so far I like it.