They don't necessarily "suck".
Its all about picking the strain that's right FOR YOU.
If you need to grow a little tiny plant inside a small confined space, or otherwise keep your plants tiny, one of the dwarf autoflower varieties could be a good choice.
If you want to grow outside, but harvest at a time OTHER than fall, or try what amounts to continuous harvests outside, that is probably THE best use of autoflower plants.
If you have a little extra space in your veg area, you can use it by growing an autoflower.
But other than these applications, autos don't have many advantages, and do have some disadvantages.
Note that saying they have ruderalis genetics in them, and ruderalis is like hemp, therefore these are like hemp is way overly simplistic.
The fact is, some of these modern third-generation autoflowering plants are over 30-40 generations removed from ruderalis plants, and contain only a small and insignificant proportion of ruderalis genes. I wouldn't say a plant that was 99% indica and 1% ruderalis (for example) was a ruderalis. Some of the current better autos are effectively indistinguishable from conventional plants in terms of flavor and potency.