Isn't Google+ pretty good for photos? You can even auto-sync photos to it. In fact it was one of the very first to do it, long before Dropbox and iCloud.
Google+'s photo sharing/storing system is great. Unfortunately, right now you have to use a third-party app if you want your G+ Instant Upload album to automatically sync to a Google Drive folder. I'm surprised Google hasn't added this feature yet. Perhaps they are intentionally refraining in order to try to induce people to share on G+?
I think it is the best design. I don't even think about uploading or sharing photo's. They're just there! Plus, set it to Wifi only and you'll not waste your precious 3/4G's.
