"Good enough" depends on who you ask. Most pictures are usefull in some way. Some only for getting information like for OSM mapping, others are also beautifull or interesting. A technically perfect image can be of some boring road showing nothing of value.
Personally I try to get the best images within the time and budget I have. That may include uploading underexposed and tilted images, but if I don't have the time to fix it, and there is no images of that location, that is the best which is possible right now.