Yeah, there are definitely some problems. But then G+ has problems too. I've had marginally better luck with Flickr's uploader fwiw (faster, fewer fatal errors for no reason), and the browsing experience is slower.
But if you're uploading lots of photos there are lots of tools out there for only Flickr that put both web UIs to shame, automatically retry, etc. The Picasa application is... surprisingly decent, but I've had worlds of pain with its buggy syncing, and it gives off a feeling of almost-abandonware.
