The problem with online groceries is lack of control over quality. Particularly fresh fruits, meats, etc - they'll grab what's on top, as far as I can tell. This is usually the fruit that's bruised, leafy vegetables that are wilted, the meat that's closest to date, etc.

Our local store's online service is actually one of the better ones I've tried in terms of finding things and getting the task done - but they fail in quality at the end.