Along with having mana/slowness/bad armor issues, Kindred's AS is too slow
You have to have Bloodrazor + Run's Hurricane, just to be even okay on Attack Speed. Even with Attack Speed boots, I think her AS is slow.
Kindred can be good but she just has so many flaws that other champs don't have.
Oh and stupid Bronze play of the day - I see Amumu and Voli going for Rift. I go over and try and steal it. I actually do somehow steal it while ulting and then I die. 2 teammates come over after I die. They do a slow and prolonged 2v2 fight. As I'm alive and coming back to the pit, no one stands over the purple rift buff. It expires before anyone actually got the buff and before I could walk to it. Amazing.