Autoflowering strains flower no matter what light schedule you are on. They are usually very quick and small...good for stealth. If you want to grow some yielding plants, then get non-autoflowering seeds.
Autos are great for keeping your stash full. Fun, quick and interesting to grow. Some strains actually give you a decent yield but personally I think the potency and taste are lacking a bit comapred to normal strains.
I am not a auto hater and continually grow them.