I hate it when people post huge numbers of photos to the same tag. Post one photo, two a day at the most. Give other people an opportunity to have their photos seen.
Instagram could fix this problem of obnoxious user behavior by placing a limit on how many photos you see from a particular user if they post too many photos with the same tag. Instagram could also give us the ability to hide a particular user whom we never want to see again. Instagram could put some limits (or stricter limits than currently exist) on how many tags you can add to a single photo.
While the people who run Instagram could do these things, for reasons unknown to me, they choose not to.